They could have resolved, not resolved, been countered, or they could even still be on the stack
Ankh of Mishra Mishra Mishra's Bauble Mishra's Command Mishra's Domination Mishra's Factory Mishra's Foundry Mishra's Groundbreaker Mishra's Helix Mishra's Juggernaut Mishra's Onslaught Mishra's Research Desk Mishra's Self-Replicator Mishra's War Machine Mishra's Workshop Mishra, Artificer Prodigy Mishra, Claimed by Gix Mishra, Eminent One Mishra, Excavation Prodigy Mishra, Lost to Phyrexia Mishra, Tamer of Mak Fawa
I dont know
However, in recent sets, various commanders have been introduced that can either produce treasure or interact with it in some capacity, leading to an increase in decks that are specifically focused around the creation and utilization of Treasure
Playing mana dorks like Elvish Mystic will allow you to ramp up on mana, so much and so quick that by turn five you could be dropping a game-ending planeswalker or creature
Artistic modifications also may not cover or change the mana cost or name of the card." Some judges choose to apply the alter criteria to misprints, but most don't