Most, if not all counterspells are instants, so anything that synergizes well with casting a lot of instants can reward your counterspell-heavy deck
Artifact When this artifact enters, if it was cast, target opponent creates a token that's a copy of it
I use dry-erase token cards and physically build a stack, resolving one by one and setting cards aside or adding them as the various triggers resolve
It has a specific cast timing and goads an opponents creatures into attacking another opponent
Not sure what to think of this tbh The stamps themselves look legit in your first picture, except maybe the sixth on in the first picture
If you pay the dash cost to cast a creature spell, that card will be returned to its owner's hand only if it's still on the battlefield when its triggered ability resolves