Good old Sol Ring - the most played MTG mana ramp card in Commander, because it's the most played card in Commander, full stop
Avatar of Woe becomes an incredibly cheap and effective threat after some milling gets done
Ulrich, Uncontested Alpha *red*, *green* Legendary Creature Werewolf 6/6 Whenever this creature transforms into Ulrich, Uncontested Alpha, you may have it fight target non-Werewolf creature you dont control
Cards like Spellskite which used to be great against removal now were clunky as you traded two mana for a one mana removal
Some of these cards are more dork based cantrips
Artifact Recursion (CTRL to add secondary) Removal Removal (CTRL to add secondary) Tokens Varchild, Betrayer of Kjeldor Whenever Varchild deals combat damage to a player, that player creates that many 1/1 red Survivor creature tokens