Please Comment

[Avooc]

These are the first two cards that I have created in a few months, and I was wondering what you guys thought of it. How could I improve them, and such?

 

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[lolwhy]

Card Grammar Fix for Guardian of Doom:

This card cannot be Normal Summoned or Set. This card can only be Special Summoned by sending 3 Spell or Trap cards in your hand or on your side of the field to the Graveyard. Once per turn during your Standby Phase you can toss a coin. If it is heads, destroy 1 of your opponent's monsters. If it is tails, your opponent gains 100 Life Points.

Comments: This card is, well, kind of underpowered for it's Summoning costs. The coin effect is boring, too. But it's balanced.

 

Fix for Plant:

Treat this card also as a Plant-Type monster. While this card is face-up on the field, increase the ATK of all EARTH monsters by 300 points.

Comments: Don't create fake types :/ Boring effect. Milus Radiant is more useful than this card.

 

Overall, take the liberties to be creative with your effects and balanced. I'm pretty sure you can do better.