Thats because, in a highly thematic touch, Morph, Space Goo can use the Shift of any other characters
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This card came from limited Extra Battle Day events, where participation was based on a lottery
Enlightened Tutor became the backbone for many combo-based decks because it could fetch most pieces of combo-based engines, including at various times Aluren, Enduring Renewal, Opalescence, Cadaverous Bloom, Pattern of Rebirth, Icy Manipulator, and Winter Orb
And you have it right, it is still a mana ability, so you can use it at any time you would have priority
