Primal Might is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.
Official card text
Target creature you control gets +X/+X until end of turn. Then it fights up to one target creature you don't control. (Each deals damage equal to its power to the other.)
Complete guide
Primal Might is a versatile green sorcery that scales with your available mana to turn any creature into a apex predator. It serves as both a combat trick on your turn and a direct removal spell, allowing your creatures to grow and immediately challenge an opponent's threats.
Scaling Power and Fighting
When you cast Primal Might, you choose a value for X and target a creature you control. You may also target up to one creature you don't control. Upon resolution, your creature gains +X/+X until end of turn, and then it fights the opposing target if one was chosen. Because the buff happens first, your creature will deal more damage and have a better chance of surviving the duel.
The Importance of Targets
Primal Might requires at least one target (your creature). If you choose two targets and the opponent's creature leaves the battlefield or gains hexproof before resolution, your creature still gets the +X/+X bonus. However, if your own creature becomes an illegal target, the entire spell fails to resolve and nothing happens. You can also cast this for X=0 just to initiate a fight.
Timing and Strategy
As a sorcery, you can only play Primal Might during your main phase when the stack is empty. This makes it ideal for clearing blockers before you declare attackers. Since the power bonus lasts until the end of the turn, any creature that survives the fight will still be significantly larger when it swings in for combat later in the turn.
Interaction examples
After using Farseek early in the game to put a Mountain onto the battlefield, you have access to more mana later. If you have five mana available, you can cast Primal Might with X=4. Your creature gets +4/+4 and then fights a creature your opponent controls, likely destroying it while leaving you with a massive attacker for the turn.
By using Nature's Lore to find a Forest, you increase your total mana pool for X. If you cast Primal Might for X=2 on a 2/2 creature, it becomes a 4/4. If it fights an opponent's 3/3, your creature deals 4 damage and takes 3 damage. Because it is now a 4/4, it survives the fight with 1 toughness remaining until the turn ends.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Primal Might
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
If the creature you control is an illegal target as Primal Might tries to resolve, no creature gets +X/+X. If that creature is a legal target but the creature you don't control isn't, it still gets +X/+X.
No other card is named in this ruling.
- #2· Wizards of the Coast
You can cast Primal Might targeting only the creature you control.
No other card is named in this ruling.
- #3· Wizards of the Coast
If you choose two target creatures and either target is an illegal target as Primal Might tries to resolve, neither creature will deal or be dealt damage.
No other card is named in this ruling.
- #4· Wizards of the Coast
You can cast Primal Might with 0 as the value of X to just have the two target creatures fight.
No other card is named in this ruling.
Legal formats
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Meta decks with Primal Might
No archived Top 8 deck with this card yet.



Farseek
Nature's Lore