Geralf's Messenger Combos
Geralf's Messenger + Ashnod's Altar + Nim Deathmantle
Geralf's Messenger + Solemnity + Viscera Seer
Ghave, Guru of Spores + Cryptic Trilobite + Geralf's Messenger
Ghave, Guru of Spores + Earthcraft + Geralf's Messenger
Ghave, Guru of Spores + Geralf's Messenger + Ashnod's Altar
Ghave, Guru of Spores + Geralf's Messenger + Phyrexian Altar
Luminous Broodmoth + Geralf's Messenger + Viscera Seer
Retribution of the Ancients + Phyrexian Altar + Geralf's Messenger
Skeleton Ship + Intruder Alarm + Geralf's Messenger
Combo result
Infinite colored mana. Infinite ETB. Infinite LTB. Infinite death triggers. Infinite sacrifice triggers. Infinite lifeloss. Infinite untap of all creatures.
Prerequisites
All permanents on the battlefield. Skeleton Ship does not have summoning sickness. Geralf's Messenger does not have any +1/+1 counters.