Your search for "Card Blocker RYMP-EN015" revealed the following:
Card Blocker - RYMP-EN015 - Common - Unlimited from Ra Yellow Mega Pack Unlimited, available at 401 Games Canada. Rarity: Common Card Text:When this card is Summoned: Change it to Defense Position. When a face-up monster you control is targeted...
Card Blocker - RYMP-EN015 - Common - 1st Edition from Ra Yellow Mega Pack 1st Edition, available at 401 Games Canada. Rarity: Common Card Text:When this card is Summoned: Change it to Defense Position. When a face-up monster you control...
Thestalos the Mega Monarch - OP28-EN015 - Common from OTS Tournament Pack 28, available at 401 Games Canada. Rarity: Common Card Text:You can Tribute Summon this card by Tributing 1 Tribute Summoned monster. If this card is Tribute Summoned: Look...