mtg supertype card type subtype all types in Card Types, Subtypes, & Supertypes in Magic: The Gathering Does Magic the Gathering card

This is better for a few reasons

While you can cast a buyback spell with flashback, like with Past in Flames, the replacement effect for flashback means the card is exiled when it resolves regardless of if you paid its buyback cost

With Mikaeus on the battlefield plus a sacrifice outlet like Phyrexian Alter (another worthwhile pick-up for any zombie deck), Mikaeus can infinitely bring back creatures with the Persist ability like Putrid Goblin

The final thing scry lands have strongly in their favour in the cube is their synergy with a wide array of other card

Things appear more stark over at TCGPlayer where, for instance, Tropical Island costs $335 if you want a Revised copy from 1994, but $999 if you want a retro frame 30th Anniversary edition from 2022