Ionian Spirit Siphon

Ionian Spirit Siphon costs {4} less to
cast if it targets a creature you control.
Destroy target creature with converted mana cost {x} or less. Destroyed creature's power is added as counters to target Wuju equipment you control
which increase the power on the artifact by
that much, as well toughness of destroyed
creature is added to the toughness on the artifact.