one piece card game op04 Trading Premium Booster Super Rare Donquixote Doflamingo OP04-031 [Reprint] Common Card Type Mr.4(Babe)

Those copies immediately die due to the legend rule, but you still get their ETB triggers, letting you tutor up 3+ things: the Kaldra pieces

The five rares from March of the Machine Jumpstart Boosters also appear in extended art, as do 42 rares and 12 mythic rares from the March of the Machine Commander set

Choco-Comet I like Choco-Comet a lot because its a flexible burn spell that can hit anything, and it scales with how much mana you put into it

[7] He gained access to Graywater's office, and alongside Umezawa, whom his associates had released from prison, they secured the key

So, it supports itself even if you build this in a way that isn't all in on counters