Cast Spike on Turn 3 or 4, activate her ability to grab Mind Twist at the end of the opponents turn, and and watch all hope drain from their face as you put them in top-deck mode before the game has really even started
Michelangelo, the Heart | 1 Colorless Mana, 1 Green Mana Legendary Creature Mutant Ninja Turtle Trample Raid (the Fridge) At the beginning of your second main phase, if you attacked this turn, put a +1/+1 counter on target creature and create a Food token
Because lots of these spells are low-cost, Hylda can likely be activated multiple times per turn
Theyd also have to keep the program open long enough to give everyone a chance to do it, which means people could just send them fakes right now and get real cards back in return
Which for four mana, seems reasonable