Obsessive Collector 
Creature — Spirit
Flying, ward 
Whenever Obsessive Collector deals combat damage to a player, seek a card with mana value equal to the number of cards in your hand.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyNOT LEGALvintageNOT LEGALcommanderNOT LEGAL