Thagras, High Seas Hijacker

Whenever an opponent gains control of a
permanent you control, create a Treasure token.
Whenever a permanent you control is returned
to an opponents hand, create a Treasure token.
{u/b}{b/r}, {t}, Tap X untapped Treasures you control:
Gain control of target creature or artifact with
mana value X or less until end of turn. Untap it.
It gains haste until end of turn. If X is 5 or
greater, draw a card.