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Blown away by Estrid's Invocation (blue enchantment for 3 mana)
[[Estrid's Invocation]] enters as a copy of another enchantment you control. At your upkeep, you may re-enter it, allowing you to choose a different target.
Note that casting it without an eligible target will void the second part. It will just stay and sit there, not triggering on upkeep.
I tried to build a deck around this card with lots of non-legendary enchantments. And found out, Sagas are particularly interesting. The crazy interaction is that Estrid's re-enter triggers before Sagas tick up.
An example match start:
- turn 2: [[Omen of the Sea]] (1U, flash, scry 2, then draw 1)
- turn 3: [[Estrid's Invocation]] (2U), gaining another scry 2 + draw 1
- turn 4: [[Binding the old Gods]] (2BG, destroy nonland), Estrid re-entered before on the Omen to get a 3rd scry2+d1
- turn 5: Estrid re-enters as the Binding, which immediately lets you destroy a second nonland. Next but still in your upkeep, both Sagas tick up, letting you fetch two
basicforests. - turn 6: Estrid re-enters