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Each of The Fantasticar's triggered abilities resolves before the spell that caused it to trigger
Memnarch Memnarch lets you steal every artifact your opponents control, plus anything you can pay additional mana to turn into artifacts
It's not terribly uncommon for someone to be a mana short of being able to help the table out either, and this is a very unique effect - the only other one that immediately springs to mind is Spectral Searchlight
1 Wildcard of any rarity A common (74.17%), uncommon (3.9%), rare (17.3%), or mythic rare (2.3%) card from the main set A common (less than 1%), uncommon (less than 1%), or rare (less than 1%) HOB scene card An uncommon (less than 1%), rare (less than 1%), or mythic rare (less than 1%) Dragon hoard card A rare (less than 1%) or mythic rare (less than 1%) book cover card 1 Rare or mythic rare card A rare (82.9%) or mythic rare (11.1%) card from the main set A rare scene card (1.8%