First, if someone says they're going to have Lutri be their companion, it's the easiest thing to fix: you just say, "Hey, did you know you can't do that?" and it likely changes what their deck is doing very little
Crypt of the Eternals and God-Pharaoh's Faithful One of the challenges of Hour of Devastation is that it's a Nicol Bolas set but it isn't a primarily multicolor set
If you use Battle at the Bridge to kill the red dinosaur, it won't actually kill it before you gain the life from the spell
But is Arena worth your time, whether its as a newcomer to the game, or a veteran making the leap to digital
The decks will include Doctor Who-inspired basics as well
For that reason, I like to have some number of creatures with high toughness such as Crocanura and Elusive Krasis to hold the fort long enough to get the engine going