Wall of Denial If given the option of your opponent playing Wall of Denial or screaming in your face for 15 minutes while you openly weep, theres a good chance that you should go with the latter option
Quantum Riddler Quantum Riddler has two main modes: the warp mode, where it enters the battlefield and cantrips, and the 5-mana mode, where its a big 4/6 flier, like Consecrated Sphinx, that immediately draws you another card
Id love to see something that copies spells, maybe a clause on the end of the mana ability that lets you copy a spell if you used that mana to cast it
Drawing a card and cheating out a spell, after all, is far more powerful than what many of the Swords of X and Y cycles are capable of
From the most common ones to legendary creatures that can serve as commanders, I go over my top picks and discuss the synergies and payoffs you can use with them