mtg cards like simian spirit guide Proxy Card – Tough Times Simian Spirit Guide | Magic

At least until the next expansion adds another couple hundred

Play both , you mill three cards , return a creature from your graveyard to the battlefield, and potentially deal a bunch of damage to each opponent all in one fell swoop

Rhystic Study From here on out are bombs and multiplayer/Commander Classics

Stacking your hand with cheap creatures to flood the board plays right into your game plan

Even if you dont think about Harnessing it, this is more than enough to make this card playable

Fewer decks have access to consistent ways to impede this combo, and those that do still have a full table of opponents to interact with otherwise