For SpongeBob SquarePants, this was done in the way of a Secret Lair, a release of a handful of cards
The addition of Ranger Class provides some added-value for the deck as well, giving it both strong early, mid, and late game cards
Scapeshift Entire decks are built around Scapeshift, as we saw with Valakut, the Molten Pinnacle decks in 2010s Modern, or even Field of the Dead decks back in M20 Standard
(In fact, there was a convention-exclusive Grimlock Magic card available at HasCon 2017.) During Hasbro's recent PulseCon it was revealed that 15 double-sided cards representing characters like Optimus Prime, Megatron, Starscream, Soundwave, Arcee, and Goldbug will be appearing in Magic: The Gathering
When Phyrexia grows upon Mirrodin, Karn is trapped in his own mind, battling between himself and the role the Phyrexians are trying to force upon him
Its Eminence ability makes every Dragon spell cheaper while safely sitting in the command zone, and its attack trigger can snowball out of control by cheating permanents into play
