mtg arena only cards Keruga, the Macrosage | Ikoria: Lair of Behemoths | Modern 5 Digital Only Cards That

Choices made for permanents as they entered the battlefield are remembered when they phase in

Rakdos Cackler is a good start since that gives you a 3/3 and then 4/4, limiting potential answers, and Tormented Hero is another reasonable target

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The ability that defines Avalanche of Sector 7's power applies in all zones, not just the battlefield

Alternatively, you can use bounce lands which auto-return to hand, and either make infinite kitties or grow your team arbitrarily big with Felidar Retreat, or just straight up murder everyone by exiling your library with Valakut Exploration

Devouring Tendrils does exactly the same as Rabid Bite for the same cost but includes Planeswalkers and possibly gains you 2 life should you kill the creature or planeswalker youre attacking