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A lot of the Tyranids in this deck have X in their casting cost and come with a new keyword ability called ravenous. Ravenous has the same text as you see on tons of hydra creatures, saying that they enter the battlefield with X +1/+1 counters on them

You've also got a few sources of life gain (see Mask of Griselbrand, Basilisk Collar, and Blood Artist), and a few ways to wipe the board if things get out of hand (see Decree of Pain and Blasphemous Act)

Aegar possesses the measured temperament of the frost giants, the combat aptitude of the fire giants, and the elemental prowess of both

Marchesa works wonders with burn spells, since theyre often able to target opponents even if they have an empty board to keep the cards flowing