Thor Odinson: Double Prowess Commander & Spells Guide
The Verdict: Thor Odinson may be the most dangerous card pulled from those Secrets of Strixhaven packs. Double prowess on a 4/4 flying vigilant body for {2}{R}{W} means a single cantrip turns him into a 6/6. Two spells in a turn makes him an 8/8. He is not a fair card — and the Boros colour identity means he has the spell density to prove it.
The Card Explained
Thor Odinson
Thor Odinson costs {2}{R}{W} for a 4/4 Legendary Creature — God Warrior Hero. He has flying, vigilance, and prowess — but not ordinary prowess. His triggered ability reads: "Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn twice." That is a +2/+2 swing per spell, not the standard +1/+1.
For reference, standard prowess on a four-mana 4/4 flyer with vigilance would already be strong. Double prowess makes this a card that threatens to end games the turn he resolves.
Understanding Double Prowess
Normal prowess adds +1/+1 per noncreature spell. Thor Odinson adds +2/+2 per noncreature spell. This is not a templating quirk — the card reads "gets +1/+1 until end of turn twice," suggesting it triggers the counter twice, once per each instance. The practical result is the same regardless: every instant, sorcery, enchantment, or artifact you cast bumps him up by two.
Some concrete numbers to appreciate how fast this escalates:
| Spells Cast |
Thor's Power/Toughness |
| 0 |
4/4 |
| 1 |
6/6 |
| 2 |
8/8 |
| 3 |
10/10 |
| 4 |
12/12 |
Turn four: play Thor, cast a cantrip. He is a 6/6 flying vigilant threat the moment he enters combat. Opponents who do not have interaction on the stack are dead.
Best Builds and Synergies
Boros Spells (Constructed)
Lightning Bolt Path to Exile Defiant Strike Shock
In a Boros list full of cheap interaction, Thor Odinson is the natural top of the curve. Every removal spell you fire off on the opponent's creatures also makes him larger. Defiant Strike — a one-mana instant that draws a card — gives him +2/+2 and replaces itself. Lightning Bolt deals three damage and gives him +2/+2. Every single card in your deck is simultaneously serving double duty.
The key insight: prowess-style decks want cheap, efficient spells anyway. You are not building around Thor specifically — you are building a Boros spells deck that naturally enables him.
Magecraft Synergies
Eruth, Tormented Prophet Birgi, God of Storytelling
Birgi, God of Storytelling generates {R} every time you cast a spell, which means each spell you cast to pump Thor also pays for the next. In a particularly loose hand, this creates a chain where you are essentially casting free spells, drawing cards, and building a 12/12 flying threat at the same time. Birgi plus Thor Odinson is a legitimate two-card engine in Pioneer and Modern.
Commander: Boros Spellslinger
Feather, the Redeemed Zirda, the Dawnwaker
As a Commander, Thor Odinson leads an aggressive spellslinger build that uses instants and sorceries as both removal and a combat pump. Feather, the Redeemed is the natural partner in a second-in-command role — she returns targeting instants from the graveyard to your hand, ensuring you always have spells to fire off to pump Thor during combat. A single Defiant Strike targeting Thor each turn draws a card and adds +2/+2, recurring forever with Feather in the mix.
Guttersnipe Monastery Mentor
Guttersnipe adds two damage per noncreature spell on top of Thor's pump, turning your interaction into a win condition from multiple angles. Monastery Mentor creates prowess tokens each time you cast a noncreature spell — building a wide board that all benefit from the same spell chain that's making Thor enormous.
Protection Package
Teferi's Protection Loran's Escape
Thor Odinson demands removal the turn he resolves. Holding up {W} for Loran's Escape — an instant that gives a creature indestructible — lets you bait out interaction and then protect him with the counter-pump active. Teferi's Protection is the nuclear option: phase out your entire board including a combat-pumped Thor mid-attack, and return to an empty opponent board next turn.
What Counters Him
He dies to exile removal before his pump triggers resolve — Sunfall, Leyline Binding, and Fateful Absence all handle him cleanly. Counter magic is effective if cast before Thor resolves, since his triggers do not add to the board until after he lands.
The vigilance means tapping tricks in combat are ineffective — he attacks and blocks freely. The flying means ground-based blocking strategies do not apply. The honest answer is: kill him immediately or do not expect to survive.
Personal Testing Note
The high-impact play that opponents rarely see coming: hold Thor Odinson until you have three or four cheap spells in hand, then cast him on curve and fire them all off on the same turn. He resolves as a 4/4, and by the time you pass priority after the final spell he is a 10/10. In testing, opponents who tapped out expecting to answer a 4/4 with standard removal found themselves facing lethal flying power before end of turn. He warps the board state immediately — do not wait to find the perfect moment to cast him.
Verdict
Thor Odinson is legitimately powerful. Double prowess on a four-mana flying vigilant legend is not a balanced rate — it is a pushed, tournament-viable threat that will require answering immediately or not at all. Boros spells lists in multiple formats should be testing him as soon as the set releases.