Domain Zoo is a fast, low-curve aggro deck with efficient one-mana threats like Wild Nacatl and Ragavan, so Brotherhood's End's creature-sweep mode (3 damage to each creature and planeswalker) can wipe a big part of their early board, including Wild Nacatl and Ragavan, in one shot. Be aware that Territorial Kavu and Scion of Draco often survive: with Leyline of the Guildpact out, Kavu is a 5/5, and Scion of Draco is a 4/4 regardless. Galvanic Relay provides extra card advantage and spell volume to keep pace in a pure race. Twinned Vision and Artist's Talent are cut as too slow against a deck this aggressive. Watch for their Stubborn Denial and Spell Pierce, which can counter our noncreature spells (including Brotherhood's End) unless we pay. If they board in Consign to Memory, note that it can only counter a triggered ability or a colorless spell, so it cannot stop our red spells; it can only hit things like Ruby Medallion or a storm trigger.