BG Graveyard/Midrange BG is another fantastic archetype
She protects your other enchantment creatures with powerful keywords and, at the end of your turn, can return an enchantment creature from your graveyard directly to the battlefield
The solution is to use the best lifegain cards, ones that provide more than just lifeor at least enough life to offset the card disadvantage
Calgar being able to take tokens of all sorts and turn them into cards, or turn surplus mana back into more Space Marines is pretty decent at translating his acumen for eking all available advantage into victory
Potentially, new playtest cards could fix this issue, however, those arent a reality just yet
Relic of Sauron You have to be playing a Grixis commander for Relic of Sauron, which is far more restrictive than most mana rocks