3m credit card sleeve M-Plateau Phone Wallet Stick on, Adhesive Slim Holder for cell phone and Phone Case Phone Card Holder Compatible with Most Smartphones (Black) : Cell Phones & Accessories Made of tough SUPCASE Adhesive Slim Wallet,2-Pack Ultra

Special Summon this card, and if you do, return that monster to the hand

This card can discard itself to send a Cyber Dragon from the deck to the graveyard to Special Summon itself and get you a Spell or Trap search

Opponents' Decks The following characters can use "Enchanting Mermaid"

Exodia, for those unfamiliar, lets you win the game when you have all 5 pieces of it in your hand

If this card is activated, you can Special Summon 1 "Helios - The Primordial Sun" from your hand or deck

Yes, on top of being reasonable extenders, these monsters each also boast an interactive effect, kind of like Therion (Coincidentally, another engine that might fit here)