Just having a 3/3 in play hits the 10-toughness threshold, and in a dedicated high-toughness deck, you can get many more benefits
6 Shivan Dragon When Shivan Dragon first appeared in Magic , players considered it one of the game's better cards, on par with the likes of Black Lotus
Theres a flash deck in Standard looming around with cards like Faerie Mastermind and Errant and Giada that can benefit from this card, not to mention Commander decks like Alela, Cunning Conqueror
Quintorius Kand, as a Planeswalker
This thing feels worth the four mana if it only gets you back a Boros Charm and a Winds of Abandon, to be honest
Captain Rex Nebula Captain Rex Nebula isn't tied to any specific Unfinity mechanic, giving you more flexibility when it comes to deckbuilding