Trask's Factory

Sentinel spells that you cast cost {2} less to cast.
{t}Add {1} to your mana pool.
{t}Add {c}{c} to your mana pool. Use this mana
only to cast Sentinel spells or activate Sentinel abilities.
{4}{c}{c}, Create a 6/6 Sentinel Creature
Token, with Flying, First Strike, and Trample.
{2}{r}{t}Deal 2 damage to any target.
Treat that Token as a Colorless
Artifact Creature.