Kiki-Jiki, Mirror Breaker [Jumpstart 2022] Arena League 2002 Armageddon Clock deals damage equal

Armageddon Clock deals damage equal to the number of doom counters on it to each player

But where is the source

"General *nuisance*

Set: Arabian Nights Type: Creature — Human Rarity: Rare Cost: {1}{W} Protection from red

Set: Oversize Cards Type: Creature — Hydra Beast Rarity: Rare Cost: {X}{G} Feral Hydra enters the battlefield with X +1/+1 counters on it

Kiki-Jiki, Mirror Breaker [Jumpstart 2022] Arena League 2002 Armageddon Clock deals damage equalSet: Jumpstart 2022 Type: Legendary Creature Goblin Shaman Rarity: Mythic Cost: {2}{R}{R}{R} Haste {T}: Create a token that's a copy of target nonlegendary creature you control, except it has haste. Sacrifice it at the beginning of the next end step. Wanna see a neat trick?