This lets the deck deal explosive amounts of damage, since most of them have prowess, and can tactically bounce permanents (or destroy them with burn damage) to deal the most damage possible in just one combat phase
Infernal Grasp Infernal Grasp is a two-cost (one generic and one black) instant spell
There's great examples at higher rarities of this, like Restorative Magic and Fire Magic both being excellent at their base level and get better at higher levels
Celebi ex can be obtained from Mythical Island Booster Pack in the Mythical Island Set
I didn't like Canoptek Scarab SwarmCanoptek Scarab Swarm at first, but after playing it and making over a dozen fliers by exiling my own graveyard, I'm a fan
This means that if you cast the top card of your library, you cant look at the next one until youre done paying for that spell