Prototype — 3/3 (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.)
When Woodcaller Automaton enters the battlefield, if you cast it, untap target land you control. It becomes a Treefolk creature with haste (This creature can attack, and as soon as it comes under your control.) and base power and toughness equal to Woodcaller Automaton's power and toughness. It's still a land.
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