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This creature enters with X +1/+1 counters on it, where X is the total number of cards in all players' hands.
{2}{G}, Remove a +1/+1 counter from this creature: Search your library for a land card, reveal it, put it into your hand, then shuffle.
If Realm Seekers enters the battlefield directly from a player's hand without being cast, it counts itself when determining the value of X.
The value of X is determined as Realm Seekers enters the battlefield. Players can cast spells and activate abilities while Realm Seekers is on the stack to remove cards from their hands if they wish, and this will result in fewer counters being placed on Realm Seekers as it enters the battlefield.
