With a decently sized initial card pool there are multiple strategies and deck archetypes that can be used, but the underlying strategy of the game revolves around deciding what cards to sacrifice to your inkwell, and when it is most advantageous to risk questing vs challenging
If you cast it any time a sorcery couldn't have been cast, the controller of the permanent it becomes sacrifices it at the beginning of the next cleanup step
Lullmage Mentor creates these when you counter spells, but that can also be done with an ability
See, not that hard, right
Typically, cactuar are very small, making them incredibly difficult to hit, and when you can't take them down they come at you with their 1000 Needles attack that guarantees you take 1000 damage every time
roll the included planar die and you may travel to a different place or trigger a chaotic effect