Gideons Lawkeeper Magic has a variety of creatures you can pay a bit of mana into to tap creatures
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Its worth a slot in nearly every Side Deck
It forces the whole table to either concede tempo or feed you a new hand every turn, in a format where both of those are game losing propositions. Martin Innes, @BillyTheDenton I also think its worth mentioning Mystic Remora in the conversation since Rhystic Study and Mystic Remora tend to have the Partner mechanic when it comes to putting them into a deck together
I think Traitorous Greed has the best potential in Zada, Hedron Grinder, where it's actually a super janky ritual that generates mana if you target Zada with it and have at least 2 other creatures on the battlefield