That way you can make sure people can actually benefit from the effect in the event of a mana screw issue popping up a few turns in
Once you pay Dismembers Phyrexian mana costs with 4 life, on the end step, youll trigger Yshtolas draw effect
Two cards that slot in relatively easily are Monologue Tax and Land Tax
Bruse Tarl, Boorish Herder & Kamahl, Heart of Krosa - Use Bruse's ability to target Kamahl, and you've got an 8/8 commander with trample, double-strike, and lifelink
My first deck was a mono-white Angel Tribal Lifegain deck that had no real payoff for gaining life
For the purposes of this list, Im just looking at the price of the most generic version of each card