(If unsolved, solve at the beginning of your end step.) Solved You may look at the top card of your library any time, and you may play lands and cast creature and enchantment spells from the top of your library
As an X-spell commander, it'll go and get you something to sink mana into, then ramp you way way up before casting it
I assume that competitive fans will be able to stick with this one while Pocket serves more casual players, but it's a little confusing to have two Pokemon Trading Card Game apps competing against one another
Grafted Exoskeleton, Phyresis, and Tainted Strike also pair very well with direct damage spells like Chandra's Ignition
It's incredibly powerful for locking in a victory (if your opponent can't attack, they can't stop you from taking your final prize) or for preventing a devastating attack when you're in a vulnerable position