One key element of the game is the use of "burn spells." Burn spells MTG are cards that deal direct damage to a player's opponent, often in the form of fire or lightning
First it immediately replaces itself drawing a card, gaining 4 puts you out of reach of Lava Spike (Omnath, Locus of Creation + Fetch Land is usually concession from Burn decks)
Prophet of Kruphix: I was very much torn between this and Consecrated Sphinx but PoK has so much value that its an immediate must-respond or you will likely lose the game under an avalanche of card draw and massive threats
Theme Boosters Kick-start your next deck with a Zendikar Rising Theme Booster
The chaos effect ranges along the exact same lines, but can potentially close out a game on the spot, so it gets a slightly higher rating
Every time you target an opposing creature, the triggered ability puts a counter on it, and once the spell resolves, the creature dies, making Shay Cormac an escalating threat