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Astral Cornucopia

Astral Cornucopia enters the battlefield with X charge counters on it.
{T}: Choose a color. Add one mana of that color for each charge counter on Astral Cornucopia.

Rarity : Rare
Types : Artifact
Artist : Aleksi Briclot
Cost converted to mana : 0

Rulings

1 February 2014
If you choose 1 for the value of X, Astral Cornucopia will cost {3} to cast and enter the battlefield with one charge counter. If you choose 2 for the value of X, it will cost {6} to cast and enter the battlefield with two charge counters, and so on.
1 February 2014
The last ability is a mana ability. It doesn’t use the stack and can’t be responded to.

Spell Crumple

Counter target spell. If that spell is countered this way, put it on the bottom of its owner's library instead of into that player's graveyard. Put Spell Crumple on the bottom of its owner's library.

Coldsteel Heart

Coldsteel Heart enters the battlefield tapped. As Coldsteel Heart enters the battlefield, choose a color. {T}: Add one mana of the chosen color.