If that blue source gets destroyed were multiple turns away from casting our countermagic
Atraxa, Grand Unifier Magic's strongest, scariest angel, Atraxa, Grand Unifier has great keywords, is one of the best lifelinkers in MTG, and looks like an impressive source of card draw
Its regularly a 3-mana 7/7 with repeatable, instant-speed tutoring, and it opens your deck up to all the usual 5-color shenanigans
It can search from the sideboard for Sweltering Suns, which wipes out the opponent's creatures, or Thought Distortion, which is a game-ender if it resolves against control decks
The Commander: Muldrotha, the Gravetide Muldrotha, the Gravetide is a 6/6 creature for that lets you cast permanents from the graveyard
Its not quite the same as a clock, but drawing cards almost makes up for it