Force of Nature

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
At the beginning of your upkeep, Force of Nature deals 8 damage to you unless you pay {G}{G}{G}{G}.

30th Anniversary Edition

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Masters Edition IV

Trample (If this creature would deal enough damage to its blockers to destroy them, you may have it deal the rest of its damage to defending player or planeswalker.)
At the beginning of your upkeep, Force of Nature deals 8 damage to you unless you pay {G}{G}{G}{G}.

Ninth Edition

Trample (If this creature would deal enough combat damage to its blockers to destroy them, you may have it deal the rest of its damage to defending player.)
At the beginning of your upkeep, Force of Nature deals 8 damage to you unless you pay {G}{G}{G}{G}.