When Ravenous Gigamole enters, mill three cards. You may put a creature card from among the cards milled this way into your hand. If you don’t, put a +1/+1 counter on Ravenous Gigamole. (To mill a card, put the top card of your library into your graveyard.)
You put a +1/+1 counter on Ravenous Gigamole if you don't put a creature card into your hand with its ability, even if there wasn't a creature card among the milled cards.
14-10-2022
wotc
If a replacement effect causes the milled cards to be exiled rather than go to the graveyard, this effect can still apply to the cards "milled this way" in exile.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.