If a bid is not offered at that level, the Auctioneer may proceed backwards until a bid is offered, and then continue up from that initial bid at increased increments
Or in Purphoros, Bronze-Blooded, a 5cmc commander full of expensive creatures, a 3cmc ramp card that taps for 2+ mana like Worn Powerstone is ideal because it lets you cast your commander two(!) turns early and start sneaking out your haymakers
Zoyowas Justice Zoyowa's Justice is set up so the owner of the shuffled permanent never gets anything more expensive than what they lost, so its fair in that regard
Once per turn, during your Main Phase: You can look at the top 3 cards of your opponent's Deck, and if you do, place them on top of their Deck in any order, but you cannot Normal or Special Summon monsters for the rest of this turn, except Fairy monsters
Unless your opponent has some spell/trap removal options, this card can mean you win on the next turn
Several Effect Monsters are treated as Normal Monsters and all Ritual monsters are treated as Divine types that can be summoned with a Ritual Spell card or via tribute.