Legendary Creature - Elemental (M)
Soul Piece enters the battlefield with X +1/+1 counters on it.
When Soul Piece enters the battlefield, search your library for a creature card with converted mana cost equal or less to Soul Piece's power and put into your hand. Then shuffle your library. [0/0]
Destroy target nonbasic land. If you used U to cast Explosive Invocation, you may put an artifact card from your hand onto the battlefield. If you used W to cast Explosive Invocation, you may put an enchantment card from your hand onto the battlefield.
Destroy target creature at the end of turn. "You should drink it in one go. Otherwise, it may have unwanted consequences."
The Underworld Cookbook
Phyrexian Editor - Fun idea! But surely a nightmare for rules, I would say. Also, while the new player can't win the game, what happens if the rest of the players lose the game?
ManyCookies - Homage to old cards, uh? Fun, but weird and out of place in today's Magic world.
Flatline - Hahaha! Fun and flavorful stuff! I love it! I would just change the name to Bandwagon.
Mergatroid_Jones - Uhm, this cards isn't good and isn't innovative.
Rocco - Oh, WOW! I love the effect. But doesn't make sense in those colors. White was the way to go for this.
SteelioKontos - I like the effect, it's just that is not very elegant. The "0 life" clause I think's it's unnecessary, as you would normally lose the game before the ability has a chance to resolve (or even trigger, maybe).
JamBlock - On the tradition of those very specific counters, this is OK, but boring. I would probably add a "Draw a card" effect, too.
Legend - WOW. Interesting effect. I can't see exactly a good reason to play this, but it is perfect Johnny material.
ManyCookies - A totally fitting name, but it's kind of random that is only two (enemy) colors (but more would have been unelegant).
Forestguy - Everything was fine until that clause about the mana not emptying. It makes it very unelegant, and random. Nonetheless, the effect is good. Mythic Rare indeed.
When Worldshift enters the battlefield, exile all permanents your opponents control.
When Worldshift leaves the battlefield, return all exiled permanents to the battlefield under their owners' control.
Creature - Human Mutant Wizard (R)
If you would draw a card, instead scry 2 then draw a card.
If you would flip a coin, instead flip two coins and ignore one. 1RU: Flip a coin. If you win the flip, draw a card. [2/3]
Creature - Human Druid Warrior (R)
Whenever a creature enters the battlefield under an opponent's control, you may have it become a 3/3 green Beast. G, T: Merciless Hunter fights target creature. When there are no preys, he'll just create one. [3/3]
Artifact T, Exile a creature card from your graveyard: You may put a creature card with converted mana cost equal or less to the number of creature cards in your graveyard from your hand onto the battlefield.