Stealth Kragen, XYZ 4

XYZ Overlay

All creatures on the battlefield are blue as long as Stealth Kragen, XYZ 4 is on the field.

{t}: Destroy one blue creature an opponent controls, the owner of that creature takes damage equal to its power.

When Stealth Kragen, XYZ 4 leaves the battlefield, search your library for target Krakens equal to the amount of cards with XYZ counters currently exiled and place them onto the battlefield without paying their mana cost.