I'd tried one of the early ones on my iPad, but it was so much less polished than Hearthstone that I couldn't really stick with it
The boost is a one-time deal, and if you have many creatures, it should be a good one
Control decks do use tempo but a lot of it is reactive tempo such as Wrath of God
Hitting two permanents and bringing them back immediately also opens this blue instant up to some shenanigans, like targeting Archaeomancer and Gilded Lotus which allows you to re-cast it infinitely
If a file looks too low-res, it will show most in rules text and mana symbols
A pattern of cards has popped up in red cards that let you take a creature from your hand and put it on the battlefield, getting around casting costs and counterspells, though they generally have the trade-off of having to sacrifice that creature at the end of the turn