How balanced are these custom MTG cards for Commander and Modern?

[SeekerOfTruth007]

Drake Equation 1UU

Enchantment - Rare

When you cast a spell, you may pay 1. If you do, create a 2/2 blue Drake creature token with Flying.

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Great Serpent 3UU

Creature - Snake - Rare

When Great Serpent enters the Battlefield, Untap up to five target lands.

When Great Serpent would leave the Battlefield for another reason, shuffle it into its owner's Library instead.

4/4

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Samurai Summons WW

Instant - Rare

As an additional cost to cast Samurai Summons, discard any number of cards.

Create X 2/2 White Samurai creature tokens, where X is the number of cards discarded to cast Samurai Summons.

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Improved Alacrity URG

Enchantment - Rare

As you cast a spell, you may discard a card rather than pay that spell's mana cost.

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Fast Talker 1UU

Enchantment - Rare

At the beginning of your upkeep, pay 1 if able. If you do, Draw a card.

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Time Burp R

Sorcery - Mythic

As an additional cost to cast Time Burp, discard a card at random, then choose and discard another card.

Take another turn after this turn.

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Quick! 4RR

Sorcery - Mythic

Create three Treasures.

Take another turn after this turn.

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Twisted Bliss 4WW

Sorcery - Mythic

Each player shuffles their Graveyard and Hand into their Library, then each player draws seven cards.

Create six Soul Gems with "Sacrifice this Gem: Gain 1 life, or prevent the next 1 damage to target creature or player."

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Peace Offerings W

Instant - Mythic

Counter target spell. Its owner gains 5 life.

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Wall of Glass 3

Artifact Creature - Wall - Rare

Defender.

Wall of Glass enters with six Temper counters on it and gains +0/+1 for each Temper counter on it.

When Wall of Glass would take damage, remove that many Temper Counters instead, then create a 1/1 Shard Artifact Creature Token for each Temper counter removed this way.

0/0

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Tackle Dummy 0

Artifact Creature - Soldier - Rare

Protection from Creatures

0/2

[AI Opinion]

Fun batch 😄 I’ll focus on power level relative to real cards.

Drake Equation: Wildly broken in Modern and Commander. Compare to Young Pyromancer / Monastery Mentor. Needs “noncreature spell” and probably cost 3U or 2UU and make 1/1 drakes.

Great Serpent: Reasonable. Five-land untap is powerful but shuffling itself is a real downside. Feels fine at 3UU as a rare ramp piece.

Samurai Summons: Totally busted. One-card combo with Faithless Looting–style effects. Needs “discard up to two cards” or cost 3WW and sorcery speed.

Improved Alacrity: Completely broken. It’s Omniscience at three mana with no timing restriction. Needs heavy restrictions like “once each turn” and maybe “mana value 3 or less.”

Fast Talker: Underwhelming. Basically an enchantment-based Phyrexian Arena that costs mana. Could be 1U and “you may pay 1; if you do, draw a card” for flexibility.

Time Burp: Extra turns are fragile design. At 5 mana this is too cheap, even with random discard. Needs to be 7–8 mana or exile itself and maybe your next untap step.

Quick!: Three treasures plus an extra turn is absurd. That’s 3 free mana plus Time Walk. Should be at least 6RR and exile.

Twisted Bliss: Commander bomb. Wheel of Fortune plus six life rocks is very strong but maybe okay at 6WW. Might need “each opponent” toned down or fewer gems.

Peace Offerings: One-mana hard counter with minor drawback is broken. Better than Mana Leak, closer to Swan Song but for anything. Needs to be UW or 1W and hit only creatures.

Wall of Glass: Very strong stall card. Six “armor” that turn into 1/1s is a lot. Probably 4 mana and ETB with 4 counters, or shards enter tapped and don’t block.

Tackle Dummy: Zero-mana 0/2 with protection from creatures is an insane blocker and equipment carrier. Needs to cost at least 1–2 mana or lose protection from creatures.