Random card ideas

[Swiftcutter]

Shrieking Wurm (3B)
Creature - Wurm
5/5
Trample
At the beginning of your upkeep, you lose 1 life for each creature in play.

Electrophidian (2R)
Creature - Elemental Snake
4/1
Haste, First strike
At the beginning of your upkeep, sacrifice Electrophidian unless you remove a counter from an artifact you control.

Chaotic Storm (2RR)
Enchantment
At the beginning of each player's upkeep, that player reveals the top card of his or her library. Chaotic Storm deals damage equal to that card's converted mana cost to that player. If the revealed card was a land card, sacrifice Chaotic Storm.

Najal of the Woods (2GG)
Legendary Creature - Druid
3/3
Forestwalk
Whenever Najal deals combat damage to a player, if that player controls more creatures than you, put a 2/2 green Wolf creature token into play.

 

[Spiderman]

All seem okay except Chaotic Storm, for its effect, seems it should be an enchantment than a sorcery. I have the perception that a sorcery's effect is immediate. If you have to wait until upkeep, it sounds like it should stay around and be an enchantment, especially since it sounds recurring.

 

[evan d]

Imagine donating shreikning wurm in 8 person free for all. Instant kill!

 

[Swiftcutter]

Oops, chaotic storm is supposed to be an enchantment. I'll fix it.