Greg, Artillerist Breachmage

Flame Breach Cannon and Blade Bane Belt —
When Greg, Artillerist Breachmage enters, gain 5
life and create a legendary land token named
Gravehold with "{t}: Add one mana of any color."

To the rescue! — {x}{r}{w}: Put X pulse counters on
Greg. Then you may remove three pulse counters
from Greg. If you do, Greg deals 3 damage to any
target and you gain 3 life.

"I got you. Gravehold stands!"