When General Leo Cristophe enters, return up to one target creature card with mana value 3 or less from your graveyard to the battlefield. Then put a +1/+1 counter on General Leo Cristophe for each creature you control.
If the target creature card is an illegal target as General Leo Cristophe's ability tries to resolve, it won't resolve and none of its effects will happen. You won't put +1/+1 counters on General Leo Cristophe.
2025-06-06 • wotc
If a card in your graveyard has {X} in its mana cost, X is 0 for the purpose of determining its mana value.