I think a ratio of cutting one land for every four mana-creatures is reasonable, so something like 23 lands and eight mana-creatures might be fine
5 Izoni, Thousand-Eyed Now were deep into the dirt of the graveyard, and Izoni, Thousand-Eyed is ready, For six mana, Izoni is a black and green 2/3 that allows you to pay two mana and sacrifice another creature to gain one life and draw a card
The mechanic really didn't take off, and while Wizards of the Coast have since printed many powerful transforming cards, Kamigawa block's flip cards were relatively unexciting
They all let you get maybe one card, but three cards for 1 mana leaves you able to cast the answers youve been trying to dig for
Of course while I was there I had to look for some old school Magic cards
But perhaps more excitingly, well also be seeing the return of textured foils