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These will stop your opponent from ever resolving their own cards

This unusual red card lets you play more lands than usual - but it's not pure ramp, you have to bounce them back to hand again

Giovannis Charisma [Pokmon 151] gives you the option to set your opponent back a turn by removing an Energy from their Active Pokmon, and you get to accelerate an Energy to your Active Pokmon too

Profits over everything at the expense of their reputation

Professional grading is about more than a number on a label

Yes, granting a creature hexproof will stop a targeted fight spell from resolving , since fight spells or abilities need to target the two creatures involved