Chances are if you're playing against Lotus Petals, your opponent's trying to achieve something unfair, regardless of the format
That is less of an issue if you have some power enter the battlefield effects, or have spare energy lying around you can easily pay for the mana cost for a turn or two.
This is a perfect place for Roiling Dragonstorm, an enchantment you should be able to have access to in your hand basically every turn
A simplified type system was used for the trading card game
Change of Fortune counts cards you discarded this turn for any reason, not just cards you discarded as part of the resolution of this effect
Should a player run out of cards to exile from their graveyard, Egon, God of Death is sacrificed and draws that player a card