Many Cleric creatures have abilities that trigger when other creatures enter or leave the battlefield and will often have some form of lifegain attached to their abilities
Decklist: Prototype in Pioneer Phyrexian Fleshgorger | Illustration by Steve Prescott Creatures (12) Phyrexian Fleshgorger x4 Arcane Proxy x4 Steel Seraph x4 Instants (15) Fake Your Own Death x2 Go for the Throat x2 Infernal Grasp Cut Down x2 Planar Incision x2 Make Disappear x4 Memory Deluge x2 Sorcery (1) Enchantments (4) Artifacts (4) Lands (24) Swamp x3 Plains x2 Island x2 Adarkar Wastes Caves of Koilos Underground River Raffine's Tower x4 Shattered Sanctum x4 Deserted Beach x2 Shipwreck Marsh x2 Takenuma, Abandoned Mire Eiganjo, Seat of the Empire This is a pretty tame deck that was meant to serve as a prototype for a casual deck based on the mechanic
Simics Adapt mechanic means that the guild also pays a price premium for power, but cards like Aeromunculus are good without having to pay the Adapt premium, unlike Orzhov cards which pay for Afterlife in their mana cost
Be honest about condition: even small surface scratches, edge wear, or off-centring can drop a card from PSA 10 to PSA 8 territory, which is often a 5 to 10 price difference
This three-drop filters your draws, blocks effectively, and survives three-damage burn effects like Lightning Bolt or a trigger from Phlage, Titan of Fire's Fury
Obviously it has some combo potential with Guile, but a card that's basically all-downside is what this is really all about
