If Trade Tokens must be used, the least the game can do is significantly lower the amount needed to swap for rare cards, because as it is now, needing 500 to trade for those with 1 gold star value is very expensive
For example, if Warrior is the chosen creature type and you control Bramblewood Paragon (a creature with "Each other Warrior creature you control enters with an additional +1/+1 counter on it."), a Runeclaw Bear would enter with an additional +1/+1 counter
Inevitable Betrayal Put Inevitable Betrayal into play and watch your opponent sweat
2 Crush Card Virus The original and most famous Virus card, Crush Card Virus, is sadly not quite as overpowered as Kaiba's - which broke the rules in the anime - but is still a bit of a beast nonetheless
Chaos: Whenever you roll Chaos, choose any number of nonland permanents you dont control