Kozilek, the Great Distortion Poor Kozilek often seems to be on the weaker side of the family, but Kozilek, the Great Distortion has mainly seen play as a colorless commander with colorless mana in the mana cost
That Leyline of Sanctity will be a quick flip, because its about due for a reprint in the next 12-18 months
You can abuse the fact that it has an enter trigger by bouncing it to your hand with Crystal Shard or Erratic Portal and cast it again, and you can double up on its trigger with Virtue of Knowledge, Reflections of Littjara, and Molten Echoes
It even has some solid midgame value on top of that
This will ensure that players don't end up in a hard spot or disadvantage against their opponent
There's also some cool card treatments, which make creatures look like a detective's dossier or covers them in invisible ink