[Evolution] (1) Discard a Beast. (If there are no evolution counters on this card, put an evolution counter on it.)
As long as there are one or more evolution counters on this card, it gains [+300/+300] and [Target Attack].
Whenever an evolution counter is put on this card, search your main deck for a card named "Drop of Yggdrasil", reveal it and put it into your hand. Then shuffle your deck.