This last point bears emphasis: along with cards like Skullclamp and Horn of the Mark that give excellent repeatable draw, I have Minions Murmurs, Pact of the Serpent, Stinging Study and Champion of Dusk to refill my hand
To start off with, the variant comes with two inherent frustrations, both rather likely to happen over the course of a game: becoming the one target for both your enemies, or having both your allies (who are enemies with each other) duking it out while you sit by and watch your enemies benefit from the progression
[G][C][C] Loom Over: 150- damage
The only exception, perhaps, is if your deck is colourless and just wants a load of utility lands with special abilities
Sarkhan, Dragon Ascendant - ( T, ETB ) - BEHOLD
There are also a lot of good cards that give this effect, such as the mighty Flickerwisp, but only ten can make it into the best flicker cards in MTG