Target 1 Normal Monster you control; Special Summon 2 Effect Monsters in Defense Position from your hand, Deck or GY, 1 with equal Type and different Attribute as the target, and 1 with equal Attribute and different Type as the target. The total Level of the target and both monsters Summoned this way must be exactly 11, and all their Levels must be different. You can banish this card from your GY to target 1 "LV" monster you control; send it to the GY and Special Summon 1 "LV" monster from your hand, Deck, or GY, whose's name appears in the target's effect, or that can only be Summoned by using the target. You can only activate each effect of "Invocation Spell LV11" once per turn.
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The combinations of Levels for the first effect are the following:
1 + 2 + 8
1 + 3 + 7
1 + 4 + 6
2 + 3 + 6
2 + 4 + 5
^That's about the extent of things I've come up with. Feel free to post here if you wanna comment on the card's balance, correct anything, or help me come up with more plays...