What about Entei & Raikou Legend
You can equip your opponent's Swiftfoot Boots, pulling them off of their commander so that you can exile or destroy it before they can re-equip on their own turn
Step 1: Card Design (WotC/Printer) The very first step in the production of Magic cards is designing them
Most Counter Trap Cards have activation condition that only allow them to be activated in response to the activations of other cards or effects (usually to negate those activations/effects), although there are others that can be activated as Chain Link 1 if their activation condition is met, such as "Black Horn of Heaven", "Negate Attack", or "Parthian Shot"
It's a little weird to think about, but having access to efficient cards like Crux of Fate and The Ur-Dragon available since you make all of your slivers a dragon seems incredible
When Mystic Sanctuary enters the battlefield untapped, you may put target instant or sorcery card from your graveyard on top of your library.