Jinseiko, an Endless Sunrise

At the beginning of your upkeep, if a player
controls more lands than you, add {c} for the
difference. Until end of turn, you don't lose
this mana as steps and phases end.
{6}{r}{w}: Untap all attacking Samurai creatures.
They gain Bushido 3 and Undying until end of
turn. After this phase, there is an additional
combat phase. Activate only during combat.