Search for Azcanta is a playable card in control decks and the front side, arguably the game saving side, is surveil 1 without the keyword
Since the tapping of the creature is part of the cost for the ability, summoning sick creatures cant activate Outlast until they are no longer sick (meaning theyve been under your control since the start of your turn)
Even better, when one of your legends dies, you get to bring back a cheaper one from your graveyard to the field
It only hits your opponents, is potent when used offensively or defensively, can be played as cheap spot removal in a pinch, and is simply one of the most efficient 7 mana spells you can play in a vacuum for what you get
The spell stays on the stack until it resolves, is countered or is otherwise removed from the stack: Various counterspells confuse and puzzle many new mages