Cannot be Normal Summoned or Set. Must be Special Summoned from your hand by Tributing 1 Level 7 or higher monster. This card can attack directly but when it does so using this effect, the battle damage inflicted to your opponent is halved.
You can revive a Dragon-type monster with Dragard’s effect upon summoning. And then tribute that monster to make Dragard or any other monster you control level-8, making them eligible as cost for Plasma Warrior Eitom.
High-leveled Normal Summon
Here are some level-7 monsters you can Normal Summon without needing to tribute. You can then use them as cost to Special Summon Plasma Warrior Eitom
Mecha Phantom Beast monsters can increase their level by the level of all your Mecha Phantom Beast Tokens which easily puts them at level-7 or higher. Tribute them to Summon Plasma Warrior Eitom for a big beater monster.