Even entire strategies can be used as a design knob to tune mutual playability, the most famous of which is the prototypical aggro deck
Most players, including myself, have a variation of Urza, Chief Artificer, that they want to bring to the table
For example, let's say you play all of your spells on curve, but your opponent plays nothing on turn one, a two-mana spell on turn two, a two-mana spell on turn three, a two-mana spell on turn four, and so on
Timetwister First up, we have the Timetwister, a card with the ability to shuffle both players' hands, graveyards, and libraries back into their decks, effectively resetting the game
There seem to be slightly fewer interactive instants than wed usually see out of the classic control color, but Scatter Ray, Machine Over Matter and Urzas Rebuff might be all you ever need
If an opponent destroys your creature in response to the connive trigger, you still draw and discard a card