
Manifest dread X times, then put X +1/+1 counters on each of those creatures. (To manifest dread, look at the top two cards of your library, then put one onto the battlefield face down as a 2/2 creature and the other into your graveyard. Turn it face up any time for its mana cost if it's a creature card.)
Valgavoth's Onslaught has 4 printings, first in Duskmourn: House of Horror (2024). EDHREC ranks it #8,090 among Commander cards. It appears most in Zimone, Mystery Unraveler decks (4,094 on EDHREC). It has 18 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.