You are never forced to activate mana abilities to pay costs, so if there is a mandatory additional mana cost (such as from Thalia, Guardian of Thraben), you can decline to activate mana abilities to pay for it and hence fail to cast the suspended card, leaving it in exile
In addition to Black Lotus, Rush illustrated more than 100 Magic: The Gathering cards, as well as working on the games five iconic mana symbols that remain to this day
In fact, Magic designers often grade other mechanics according to what they call The Storm Scale: how powerful is the mechanic on a scale of 1 to storm
If Blightsteel Colossus is ever put into the graveyard, it's simply put back into the deck, which in turn helps you from ever milling out your deck for certain combos
I hate discussion of market value of cards, it actively harms the hobby I guess you'd have no issue trading your Oricorio ex SIR for someone's Mega Sharpedo ex SIR