mtg untap cards Staff of Domination (BRR) #119z where X is the number of Mountains you control mtg cards that untap permanents

I dont know if this hits $8 ever but I do know its spicy

Divine Convocation is a White/Blue/Red Tokens deck with a twist: it's the first ever precon to focus on Tap/Untap Shenanigans, specifically the Convoke mechanic: the goal of this deck is to flood the board with creatures and tokens thanks to cards like Kykar, Wind's Fury, then tap them to ramp out powerful convoke spells like Venerated Loxodon and Wildfire Awakener

It seems as though only a third of the deck's creatures are squirrels but it has plenty of cards like Chitterspitter that'll help you create a formidable army of vicious rodents

Although it is not necessarily overpowered, casting a Ledger Shredder on turn 2 followed up by a Mishras Bauble allows you to connive with the bird straight away