Fallen Empires , for an example, had a pretty infamous incident where a handful of the cards were accidentally printed with card backs for another collectible card game of its time: Wyvern
Promo Info BOOSTER WORLD CONVERGENCE [BT-21] CLOSECLOSE BT21-099 C Option Xros Up Color Purple Form - Attribute - Type Hunter DP - Cost 1 Digivolve Cost 1 - Digivolve Cost 2 - Upper Text [Main] You may place 1 Digimon card with Save in its text from your hand or trash under any of your Tamers
When activating the effect of that monster, he says "Topologic Trisbaena activates its effect!" followed by "Exile's Retribution!" Most of the time, when Varis declares an attack with that monster, he says, "Attack, Topologic Trisbaena!" followed by "Dire Destruction!" When Varis Link Summons "Topologic Zeroboros", he chants " " followed by " I manifest my circuit
That said, the activated ability on this thing is potentially wild
The Pokmon Trading Card Game has received a new Pokmon Go expansion based on the immensely popular mobile game
