Eldrazi Bloodhunter

Haste, Vigilance
When Eldrazi Bloodhunter enters the battlefield, create {x} 1/1 colorless Eldrazi Scion creature
tokens. They have "Sacrifice this creature: Add {c} to your mana pool." Whenever an Eldrazi you control dies: Add {c} to your mana pool.
At the beginning of combat on your turn, if
three or more Eldrazi creatures you control died
this turn, transform Eldrazi Bloodhunter.