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An XRR spell is a long way from mana efficient, it never really gets to being efficient either, even when it does double damage
Both are nice additions to the Starter Decks already being offered from previous sets, and they're both built in a way that should be easy enough to learn from a newcomer's perspective
Theres a great deal of cards and choices to be made here, but one crucial thing to think about is your win condition
If we go down this path every two months and rearrange all the pieces of a system that has been overall quite successful thus far, it's going to erode people's ability to learn the system properly
Since youre going to have a sacrifice outlet like Altar of Dementia, Ashnods Altar, and Phyrexian Altar, you can keep the thrull count low if you want