When you cast a disguise creature, you can do it at any time youd normally be able to cast a creature spell, as its simply a different way to cast it
This can take a while if you don't have a lot of mana or if your opponents don't all have permanent spells on the bottoms of their graveyards
Artifact Agatha's Soul Cauldron You may spend mana as though it were mana of any color to activate abilities of creatures you control
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If an effect allows you to spend mana "as though it were" mana of any color or type, that allows you to spend mana you couldn't otherwise spend, but it doesn't change what mana you spent to cast the spell
Old School 95/96 | Abe Sargent Creatures (22) 2 Stromgald Cabal 4 Black Knight 4 Erg Raiders 4 Hypnotic Specter 4 Knight of Stromgald 4 Order of the Ebon Hand Instants (8) 4 Dark Ritual 4 Terror Enchantments (4) 4 Bad Moon Artifacts (2) 2 Serrated Arrows Lands (24) 24 Swamp The typical aggro deck of the day that won was White weenie, because of Swords to Plowshares