I wouldnt overload on these effects because, with too many of them, you wont have enough sources of actual damage
You control the effect, so you use it on your turn, which lets you play cards like sorceries and creatures and even drop a land
Even with that Deathmark still has a lower hit rate than a Shock in cube, has no alternate utility, is sorcery, and will wind up a totally dead card in some matchups
Thalia doesn't control where the Gitrog Monster takes her and remains wary that, should the steady supply of invaders run out, she could become its next meal
This card generates some of its own dinosaurs to buff if you suspend it, which can be worth the wait since the tokens have flying and are relatively strong once you get this Boros creature on the field
This cinematic ending to the series absolutely delivers, Aang uses all the lessons he learned and you see Azula and Zuko in the fight of a lifetime