When it phases back in, it will still be able to target those opponents with its upkeep-triggered ability
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For four mana, I can deal X damage to target creature or planeswalker, where X is the greatest power among creatures I control and if it would die this turn, I can exile it
For consistencys sake, Esper has access to the best practical tutors for this combo
Green/Purple Luffy is designed for players who enjoy a combo-heavy deck that can sustain board presence while applying consistent damage
However, if you go through a ducting system, you just need cards of equivalent rarities, not value