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I have Omnath in a real life Commander brew built around Wildfire effects to ramp, drop him, Wildfire and keep what Elementals I dropped, and then if any died, I can use their death triggers to kill wounded stuff

attach that monster from the Graveyard to that Xyz Monster as an Xyz Material

In theory, yes, as any MTG card should have the same pattern that's been used by WotC since Alpha

namely "Hugin the Runick Wings" (which can banish itself to protect "Runick Fountain" in response to destruction effects) and "Munin the Runick Wings" (which can negate any opponent's card or effect that targets a "Runick" card or a Set card)

Attune with Aether is one of the cards that works with Deeproot Champion that wouldnt have worked with Quirion Dryad, but more importantly, Chart a Course is legal, and cheap burn is much appreciated at the moment

Since the number of cards in hand does not change, it is easy to draw into hand traps or traps