Kaoz Ridge Regent

Flying, haste
When Kaoz Ridge Regent enters the battlefield,
it deals 4 damage to each other creature each
player controls.
Pact — You've sacrificed four or more Treasures
this game. (As long as this card's pact condition has
been met, change "player" in its text to "opponent.")
"Many dragons' loyalties can be gained with the right amount of gold...well, the ones that don't exercise their right to just eat you and take your treasure."
---Ruvus, Kaoz Ridge guide