Crown of Convergence RAV/258

Set: Ravnica: City of Guilds
Collector Code: RAV/258
Name: Crown of Convergence
Type: Artifact
Oracle text: Play with the top card of your library revealed. As long as the top card of your library is a creature card, creatures you control that share a color with that card get +1/+1. {G}{W}: Put the top card of your library on the bottom of your library.
Rarity: Rare