The Blight Curse Commander Deck is a well-designed, high synergy deck that really does allow you to curse your opponents, bringing advantage by wielding Blight mechanics (which place -1/-1 counters on creatures) and allowing compounding benefits like card draw and life gain
Eleven, the Mage / Cecily, Haunted Mage is by all means a viable commander, with a main focus on card draw
But before you do that, lets consider how many colors you want to play
Mai, Scornful Striker A 2/2 with First Strike for two mana is already premium stats, but Mais ability punishes opponents for playing the game
The main reason is that Ralts is surrounded by flowers, collecting them, which symbolizes how much you care for your partner
With Zevlor, that simply wont be the case