MArcomage

I like the idea of a card to counter no-keyword decks... But comparing to Sheat Your Words it's much harder to summon

Monastery, Temple of light, Prayer, Dwarven watchtower, Dwarven fortification, Scepter of summoning, Scepter of evolution, standard drawing. Did I miss something?
Problem is not in summoning of this, problem is that card probably will give to the opponent almost ideal counter for itself - Purifying fire.

Added Pure Holy Keyword and removed commons only
No chance for annoying Purifying Fire.
Better to allow little building with Cathedral or Monastery and to lost some resources from Invocation than to die from Orc Regiment, Revolt, Devil, etc :)

"Rares are replacable by Invocation." What? Does this mean Rares are "replaced with" Invocation?