Tower of the Unknown

Haste, Ward {3}
{t}: Add {w}{r}
Whenever Tower of the Unknown's controller
casts a spell with {x} in the casting cost, create a
number of 1/1 red Brick tokens with haste.
Sacrifice those tokens at the next end step.
If the spell cast is an instant or sorcery spell
where {x} is 7 or more, that spell gains lifelink.
Tower of the Unknown's power is equal to
number of artifacts it's controller owns.