Dolzelack, Aetherial Magus

Whenever an opponent taps a permanent for
mana, add that much mana to your mana pool.
Spend this mana only on creature's abilities.
{3}{u}: Draw two cards.
{x}{g}: Create X 1/1 colourless Eldrazi Monkey
tokens.
{1}{c}: Your next spell has convoke. Sacrifice all
creatures that were tapped to convoke it.