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Gogo, Mysterious Mime Doubling up on your best creature each turn is already strongbut both copies get +2/+0 and haste, and theyre ready to swing
The Blossoms was so good it made the cut in Standard decks during its era for tapping to bounce with Tradewind Rider in both Trade/Geddon that bounced lands after casting Armageddon or with Awakening in TradeAwake to tap and untap
Since most of your X spells can hit multiple targets, Mavindas ability can help you squeeze even more value from them
The deckbuilding requirement reminds me a lot of companions, specifically Lurrus of the Dream-Den, but without the degenerate part of starting in your opening hand
OK, if you played Putrefy when it was legal the last time we visited Ravnica, this explanation is not for you