Woodcaller Automaton {10}
Artifact Creature — Construct
Prototype {2}{G}{G} — 3/3 (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.)
When this creature enters, if you cast it, untap target land you control. It becomes a Treefolk creature with haste and base power and toughness equal to this creature's power and toughness. It's still a land.
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Cards that do something similar expected a card that isn't here?
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Tideforce Elemental 86%
$0.29#14226
"Whenever a land you control enters, you may untap this creature."