Ray Fillet, Wave Warrior

If multiple creatures enter at the same time, evolve may trigger multiple times, although the stat comparison will take place each time one of those abilities tries to resolve. For example, if you control a 2/2 creature with evolve and two 3/3 creatures you control enter, evolve will trigger twice. The first ability will resolve and put a +1/+1 counter on the creature with evolve. When the second ability tries to resolve, neither the power nor the toughness of the new creature is greater than that of the creature with evolve, so that ability does nothing.

If evolve triggers, the stat comparison will happen again when the ability tries to resolve. If neither stat of the new creature is greater, the ability will do nothing. If the creature that entered the battlefield leaves the battlefield before evolve tries to resolve, use its last known power and toughness to compare the stats.

If a creature enters with +1/+1 counters on it, consider those counters when determining if evolve will trigger. For example, a 1/1 creature that enters with two +1/+1 counters on it will cause the evolve ability of a 2/2 creature to trigger.