5 cards where the illustration contains “waterskin”

Braidwood Cup (Urza's Destiny #126)
Feywild Trickster (Adventures in the Forgotten Realms #58)
Goblin Guide (Double Masters #347)
Rofellos, Llanowar Emissary (Urza's Destiny #118)
Tinker's Tote (The Lost Caverns of Ixalan #40)

This search is finished. Now the real work can begin.