Overlord of the Mistmoors Four mana for two flying 2/1 tokens is a fine deal for a token generator in white, but I need a bit more to be excited to play that card
Exiling four cards plus your draw steps means this enchantment could potentially kill you by the time eighteen more turns go by
Call of the Ring will tempt you every turn , making one of your creatures into the Ring-bearer for escalating beneficial effects
Grixis has a ton of cards that either support or benefit from spellcasting, not to mention ways to protect Eleven so that it can attack every turn and give you free spells
I like having Ornithopter available since we can hold it in hand until the turn we want to cast Sephara, potentially surprising our opponents who werent expecting Sephara a turn early
As long as Melira is on the field with Phyrexian Vatmother, you wont receive any poison counters on your upkeep if you need more time to draw into your win condition