Estrid's Invocation

Any enters-the-battlefield abilities of the copied enchantment will trigger when Estrid's Invocation enters the battlefield. Any "as [this enchantment] enters the battlefield" or "[this enchantment] enters the battlefield with" abilities of the chosen enchantment will also work.

Estrid's Invocation copies exactly what was printed on the original enchantment (unless that enchantment is copying something else or is a token; see below). It doesn't copy whether that enchantment is tapped or untapped, whether it has any counters on it or any Auras attached to it, or any non-copy effects that have changed its types, color, or so on.

If the copied enchantment has {X} in its mana cost, X is considered to be 0.

If the chosen enchantment is copying something else (for example, if the chosen enchantment is another Estrid's Invocation), then Estrid's Invocation enters the battlefield as whatever the chosen enchantment copied.

Once Estrid's Invocation returns, it's considered a new object with no relation to the object that it was. You must choose an enchantment that's currently on the battlefield to copy (or to not copy anything). Auras that were attached to it will be put into their owners' graveyards. Any counters that were on it cease to exist.

If the chosen enchantment is an Aura, you choose what it enchants just before Estrid's Invocation enters the battlefield. The chosen recipient must be able to legally be enchanted by the Aura Estrid's Invocation will be. This doesn't target the player or permanent it will enchant, so an opponent's permanent with hexproof may be chosen this way.