Teferi, Temporal ArchmageFirst win condition : Chain veil + Teferi + enough mana rocks for casting Teferi an infinite number of time = infinite planeswalkers triggers. Use teferi's +1 ability to find
Ugin, the Spirit Dragon and use his +2 ability on each of your opponents.
Second win condition : Infinite mana +
Stroke of genius on one of your opponents.