Although the two abilities arent really related, flashback at instant speed is definitely powerful
7 Great Stone Dragon Use Your Banished Characters As Ink Great Stone Dragon is a game-changer when you want to put fallen or discarded characters to good use
(Subtypes include but are absolutely not limited to: Plains, Equipment, Aura, Arcane, Jace, Curse, Urza's, Ulamog's, etc.) The ability that defines Subgoyf's power and toughness applies in all zones, not just the battlefield
Another problem that Pillow Fort decks typically run into is mass board resets like Cyclonic Rift, Austere Command, Bane of Progress and the like
Players can expect faster setups, higher damage ceilings, and new synergies that could push certain archetypes to the top of the ladder