Tolbat-Xo, the Sentinel

Reach, Trample
Landfall-Whenever a land enters the battlefield under your control, Tolbat-Xo, the Sentinel gains one -1/+1 token.
Escape-{x}{b/g}, Exile four other cards from your graveyard. (You may cast this spell from the graveyard for it's escape cost, where X is 10 minus the number of -1/+1 tokens on Tolbat-Xo.)
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