pikachu pokemon card 2021 POKÉMON GAME S8b 223/184 CSR VMAX Attack 1 Pokemon Card ARS10 Pikachu S8a-G

The single card rewards you receive for some quests you complete and for meeting certain milestones of the Mastery Pass

Most judges would probably disallow this though, since the mana-adding is no longer being done in the most efficient way, and this starts to run afoul of the intention behind the "players may not make irrelevant changes between iterations" line

Polymorph swaps creatures for strong ones

At the very least, it's certainly trying - in a deck with ways to make Bear creature types stronger, Kudo ensures every creature will benefit, while it can also disrupt strategies that want to hone in on creating a strong board presence with lots of built-in stats

Mortuary Mire

This commander screams group slug to me, making the perfect leader for a deck running a ton of hurts everybody effects like Sulfuric Vortex, and its color identity means you get access to both Pestilence and Pyrohemia to damage your opponents and trigger enrage simultaneously