Partner New text : Jeska, Thrice Reborn enters the battlefield with a loyalty counter on her for each time you've cast a commander from the command zone this game
Eccentric Robot and Yokai Professor Callaghan dont really do much here either
Mercy Killing in particular seems good with many of the strategies we can pepper into our deck, giving Drizzt a death trigger and giving us a bunch of Elf tokens too, all at instant speed
Alice, Growing Girl is a sapphire Rise of the Floodborn card that benefits from being supported, as whenever it has 10 strength or more it can then quest for four additional lore
Crew 3 (Tap any number of creatures you control with total power 3 or more: This Vehicle becomes an artifact creature until end of turn.) After the first ability has resolved targeting a creature, that creature has lifelink and can't be blocked for the rest of the turn, even if its power increases to 3 or greater
It's hard to count on them to be on the battlefield all the time, which makes decks that rely on their commander inconsistent