Rather than exiling a card from your hand or graveyard, Exclusion Ritual is essentially a white removal spell that prevents extra copies of the imprinted permanent from being cast
That's a reskin for one of Magic's most ubiquitous cards, Lightning Bolt, and I wouldn't be surprised if this particular printing has quite the impact on the set
In this case, the wrong foil stamp die was used to stamp the name of the card, leading to this Gate Guardian being incorrectly labeled as a Tri-Horned Dragon
This typically means mana-acceleration effects that will help you produce eleven mana naturally for someone like Ulamog, the Infinite Gyre when you can't bring him to class for Show and Tell
It is a zero-mana spell that replaces itself at the cost of one turn and its an artifact, fueling abilities like Delirium which are key for some decks
Scalpers even hassled visitors, asking to sell them the Pikachu card for cheap so they can resell it on the secondary market