Activate Zombie Infestation by discarding two cards, creating a 2/2 Zombie creature token.
Activate Umbral Collar Zealot by sacrificing the Zombie, whose power should have been altered from its base power.
When the Zombie dies, Jason Bright triggers, causing you to draw two cards.
Resolve the Umbral Collar Zealot ability.
Repeat.
This crafty loop turns the graveyard and your hand into an endless engine for profit, heavily amplified by the presence of Bard, King of Dale. You start by using Zombie Infestation to churn out a Zombie token, which is instantly doubled into a pair of tokens by Bard, King of Dale's token-doubling replacement effect. You then feed one of those tokens to Umbral Collar Zealot's sacrifice ability to surveil, altering the creature's power beforehand so that Jason Bright, Glowing Prophet recognizes the death and triggers. Thanks to Bard, King of Dale, that single draw trigger is upgraded to draw two cards instead, constantly feeding the very hand size you need to keep discarding to Zombie Infestation.