Hedge Whisperer
Creature — Elf Druid Detective
You may choose not to untap this creature during your untap step.
, 
, 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.)
Simon Dominic
Rulings
If Hedge Whisperer leaves the battlefield before its activated ability resolves, the target land won't become a creature at all.
(wotc • 2024-02-02)
If you can't exile enough cards to meet or exceed the required mana value, you can't choose to collect evidence at all.
(wotc • 2024-02-02)
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.
(wotc • 2024-02-02)
Rulings
If Hedge Whisperer leaves the battlefield before its activated ability resolves, the target land won't become a creature at all.
(wotc • 2024-02-02)
If you can't exile enough cards to meet or exceed the required mana value, you can't choose to collect evidence at all.
(wotc • 2024-02-02)
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.
(wotc • 2024-02-02)