
Creature — Plant Wurm
At the beginning of combat on your turn, put X +1/+1 counters on each creature you control, where X is this creature's power.
1/3
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→ Lock, Infinite turns
→ Infinite colored mana, Infinite combat phases, Infinite untap of creatures you control
The value of X is calculated only once, as Ouroboroid’s ability resolves.
If Ouroboroid leaves the battlefield before its ability resolves, use its power as it last existed on the battlefield to determine the value of X.