First, the deck casts creatures that synergize with your spells including Flamehold Grappler (copies a spell), Taigam (copies spells via suspend), Narset (card draw), Monastery Mentor (1/1 prowess tokens), and Jeskai Brushmaster (double strike, prowess)
Perhaps the best overall Reanimation spell in Standard is also somewhat awkward to cast: Invoke Justice, a 5 CMC spell that require *four* White and 1 colorless, returns a permanent from your graveyard and also allows you to distribute 4 +1/+1 tokens
You can sacrifice Ranger-Captain to stop opponents from casting noncreature spells for the rest of the turn
As many players pointed out in the comments, we have a few tools for such a deck already
Massive spells were rendered moot by In the end, it was their sideboard choices that made all the difference
With all that being said, make sure youve got your hands on Arena Tutor if you play MTGA