Hisui-no-Ryu

Eminence — As long as Hisui-no-Ryu is in the
command zone or on the battlefield, other Spirit spells you cast cost {1} less to cast.
Flying, Lifelink, Protection from Spirits
When Hisui-no-Ryu enters the battlefield, gain
life equal to the number of Legendary Spirits you
control.
At the beginning of your upkeep, if you control
eight or more Dragon Spirits other than
Hisui-no-Ryu, you win the game.