Cards that can remove the Field Spell, like "Ghost Ogre & Snow Rabbit", "Cosmic Cyclone", or "Set Rotation" can severely hamper the deck's effectiveness, while cards that can temporarily negate the Field Spell, like "Ash Blossom & Joyous Spring", can delay the deck's swarming for a turn
Afterward, there will be a cut off the top record-holders (approximately the top 1/8 of participants) where players will play best two out of three matches and the loser gets eliminated (standard tournament bracket style), with an eventual winner
Itll give you more bang for your buck out of any amass ability or any sort of +1/+1 counter distribution
GX, like Zane Truesdale
(9/29/2017) Replacement effects that modify creatures of a certain type as they enter the battlefield will apply (or not apply) after you apply this effect
Sacrifice after III.) I - Aerial Blast - This creature deals 4 damage to target tapped creature an opponent controls.II, III - Slipstream - Another target creature you control gets +1/+0 and gains flying until end of turn