Seaside Citadel
Players take on the role of Planeswalkers, powerful beings who can travel the multiverse at will, and do battle with rivals by casting spells, manifesting magical artifacts and enchantments, and summoning minions and even other Planeswalkers to do their bidding
Traveling Chocobo may only be a 3/2 for three mana, but being able to play lands and Birds from the top of your library, and doubling landfall triggers, are both incredible effects
But perhaps Wizards of the Coast is about to release a new one that'll be more your speed
WHIP OF EREBOS Speaking of re-usable, Whip of Erebos makes the list as one of the best single-card value engine black mages have ever been blessed with
You can proxy a card and put it in your deck, and proxies are totally accepted and sometimes even incentivized by the casual community