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The common ETB taps and taps for your color identity mana then when you tap it for a Human
Mark Rosewater, WotCs leading designer for MTG has already said that its difficult for the mechanic to return, but its more likely to do a tweak of it thats a little easier to use. In any case, we know that sometimes copying spells is related to the theme of a set, and in those cases, we can see something similar to conspire making a comeback
But aside from your other planeswalker payoffs like proliferation abilities, theres a few cards that mention Ajani planeswalkers by name
SR Super Rare Submareed Tour Ride X WATER Level 6 [ DinosaurEffect ] ATK 2200 DEF 0 The first Normal Monster you control that would be destroyed by battle or card effect each turn, is not destroyed