My first set of cards please review

[1amayzingman]

This is my first set of cards please grade them and help me with the correct word usage.

This monster can only be Ritual Summoned with the Ritual Spell Card "Arcanist Library". You must also offer monsters whose total Level Stars equal 9 or more as a Tribute from the field or your hand. As long as this monster is in play, any damage dealt to your opponent's life points is increased by 300.

Once this card is played, each player selects 1 monster from their side of the field. As long as this card is in play, only those two monsters may attack, they may only attack each other, and they cannot be destroyed by any effect, magic, or trap cards. When a monster is attacked, flip 2 coins. If at least 1 of them is heads, the attacking monster gains 500 attack and defence points for that battle phase. If both coins are tails, the attacked monster gains 500 attack and defence points for that battle phase. If either of the 2 picked monsters dies, this card is destroyed, and the person who owns the destroyed monster loses 1000 life points.

This card may not be placed in attack mode and cannot be changed into attack mode by any means. This card gains 500 attack points per turn. If this monster's attack becomes greater than 3000, it is immediately reduced to 3000. Once per turn, if this card has more than 1000 attack points, you may reduce the attack of this card by 1000 to stop a monster's attack and prevent that monster from attacking for a full turn.