Tyvar, Jubilant Brawler

The static ability is the one that changes how the whole deck runs: creatures with tap abilities normally sit dormant the turn they arrive, and this quietly deletes that summoning-sickness tax on every tap or untap ability your board offers. Mana dorks tap for mana immediately, tapper creatures lock down a blocker the moment they land, and any creature with a tap-based ping ability comes online without a turn of lag. That passive is the real engine; the loyalty abilities are built to feed it. The +1 untaps a creature (a mana dork or a strong tap-ability body gets used twice in a turn) while ticking the walker toward another activation. The -2 mills three and rebuilds the board from the yard, restricted to creatures of mana value 2 or less: exactly the small utility bodies whose tap abilities the static ability wants to abuse. It is a coherent piece of design where each line points back at the others, a Golgari value planeswalker whose payoff is not raw card advantage but tempo, turning the drawback that creature-activation decks have always fought (the dead turn a creature enters) into a nonfactor. Untap-and-activate synergies have historically lived in green-blue and green-white shells; anchoring the enabler on a three-loyalty walker in black-green ties the trick to graveyard recursion rather than to blink or ramp.