Are you supposed to remove counters from grindclock when using its second ability?
Are you supposed to remove counters from grindclock when using its second ability?
No.
Fluttershy is best pony.
When you're supposed to remove counters from a card, the card itself will make this abundantly clear. See: Angelheart Vial, Arcane Spyglass, Golem Foundry and countless other cards.