yugioh heart of the cards Yu-Gi-Oh! Common Attack Heart of the Blue-Eyes -

you'll put down a 'run' of numbered cards in a race to empty your hand, but must beat the previous score on the table

The biggest risk is that the fast mana it gives would power up combos too much, and while it's probably safest to have Chrome Mox banned, it does seem strange to see it on the banned list after watching Affinity play Mox Opal on Turn 1 and dump literally their entire hand onto the battlefield

Deadly Rollick - $36 Perhaps the most exciting Commander Masters spoiler we've seen thus far, Deadly Rollick is notable because it's part of a cycle of spells that are free if you control your commander

Pyro Dance Once during your turn, your may attach up to 1 Basic Fire Energy and up to 1 Basic Fighting Energy from your hand to your Pokemon in any way you like

Treasures, foods, fetchlands, and tokens all become momentum

Though many of the variants of this card sell for $40+, there is a cheaper alternative that you can find for around $4 if you really want to use it in your deck