serra cards mtg Angel (Magic × Duel Masters Promos) damage that would reduce your life total to less than 1 reduces it to 1 instead Serra - MTG Wiki

: Level 2 Whenever you gain life, put a +1/+1 counter on target creature you control

It is much easier to kill in cube than it is in a format like modern, in addition to that it is all too easy to ignore the effect of Keranos in the cube as well

Sacrifice after III.) I Until your next turn, whenever a creature attacks you or a planeswalker you control, it gets -2/-0 until end of turn

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Also, proxies are generally not allowed in official Magic: The Gathering tournaments

We have access to the best of the you win colors in blue, so Thassas Oracle and Laboratory Maniac represent some sweet alternative win conditions here