Yavimaya Bloomsage // Channel + Stensian Sanguinist // Exsanguinate

Yavimaya Bloomsage // Channel

Stensian Sanguinist // Exsanguinate

How it works

1. Cast a copy of Channel by paying .
2. Activate the ability granted by Channel by paying 1 life, adding C.
3. Repeat step 2 as desired.
4. Cast a copy of Exsanguinate by paying and all remaining available mana, causing each opponent to lose a significant amount of life and you to gain life equal to the life lost this way.