Skipping your own draw step, for instance
The Flip Walkers Ajani, Nacatl Pariah / Ajani, Nacatl Avenger and Grist, Voracious Larva / Grist, the Plague Swarm feel like they can see Modern play, perhaps slotting into Zoo and Yawgmoth, respectively, or reviving some aggro or graveyard archetypes
Tamiyo, Inquisitive Student / Tamiyo, Seasoned Scholar I find it fun to have reasons to attack with 0-powered creatures, so I want to like Tamiyo, Inquisitive Student but the defensive nature of this moonfolk, and the difficulty of drawing a third card is not as trivial as you might think
Once per turn, during your Main Phase: You can decrease the Level of 1 "Penguin" monster in your hand or face-up field by 1 (until the end of this turn), then discard 1 card
Read what's written on the card
It also pairs up well with either the Marauding Captain or Command Knight, which could present a nightmare strategy on opponents that's fairly tough to counter