How strong are these custom Magic cards for Modern and Commander?

Question

Cradle of Civilization

Land - Rare

T: Create one Treasure.

==

Queen Bee 2GG

Creature - Insect - Rare

Flying. Deathtouch.

At the beginning of your Upkeep, Create a 1/1 Green Insect creature token with Flying and Deathtouch.

2/2

==

Crystalize UU

Instant - Rare

Counter target spell. Create two Treasures.

==

Brain Trust BGU

Legendary Creature - Outsider - Rare

When you draw your second card each turn, you may draw another card.

You may cast spells from your Graveyard as though they were in your hand. If you do, lose life equal to the Mana Value of each spell cast this way, then exile each card cast this way as it finishes resolving.

3/4

==

Melting Dragon 4RR

Creature - Dragon - Rare

Flying.

When Melting Dragon Enters, it deals 4 damage to each enemy creature.

4/4

==

Solipsism 4WW

Enchantment - Mythic Rare

All permanents you control have Hexproof.

You can't lose the game.

==

Sealed Fate 3BB

Enchantment - Rare

If you win the game, you win the entire match too.

Cinematic Lily · Accepted Answer

These would be completely busted in both Modern and Commander 😅

Cradle of Civilization is way beyond Treasure Vault/Goldspan power; a land that just taps for Treasures breaks economy decks.

Queen Bee is fine in Commander but pushed for Modern; constant 1/1 flying deathtouch tokens snowball hard.

Crystalize is stronger than Counterspell, closer to free-mana combo fuel.

Brain Trust is Yawgmoth’s Will stapled to a value engine; absurd in any format.

Melting Dragon is strong but closest to fair, like a pushed Glorybringer/Stormbreath hybrid.

Solipsism is totally unprintable: “You can’t lose” plus global hexproof ends real interaction.

Sealed Fate doesn’t work in normal rules; where allowed, it’d be a sideboard nightmare and unfun.