Hedge Whisperer
You may choose not to untap this creature during your untap step.
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, Collect evidence 4: Target land you control becomes a 5/5 green Plant Boar creature with haste for as long as this creature remains tapped. It's still a land. Activate only as a sorcery. (To collect evidence 4, exile cards with total mana value 4 or greater from your graveyard.)
Illustrated by Simon Dominic
This printing
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If Hedge Whisperer leaves the battlefield before its activated ability resolves, the target land won't become a creature at all.
If you can't exile enough cards to meet or exceed the required mana value, you can't choose to collect evidence at all.
Once you've announced that you're casting a spell, players can't take actions until you've finished doing so. Notably, opponents can't try to remove cards from your graveyard to stop you from collecting evidence.
