Full Moon Ritual

Every time you summon a werewolf creature
place a counter on this card.
If this card has 4 counters on this card you may sacrifice it and create a 7/7 black Giant Werewolf
with Annihilator 1. Then target player has to sacrifice 5 permanents.
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"The ultimate ritual to bring the spirit of the
hunt to semi-flesh I guess, however such a ritual demands sacrifice."
-Garrison the Moonscribe