You may have this enchantment enter as a copy of an enchantment you control, except it has "At the beginning of your upkeep, you may exile this enchantment. If you do, return it to the battlefield under its owner's control."
Colour identity Blue
In short
Estrid's Invocation has 3 listed printings; the most valuable is the Secret Lair printing from SLD at US$7.73 on TCGplayer's market price. Prices below are the cheapest in-stock listing in the United States.
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