Three cards have been shown in this new rarity: Pikachu, Mewtwo, and Mew
Six mana is pretty steep, but in a green deck, thats not that hard to achieve
Additionally, its retreat cost of two can make it difficult to protect once it has sustained significant damage
In the context of the card, it appears to be wordplay on the fact that the word "present" can refer to a gift you give to someone (in which case, it's pronounced like "pleasant") or the act of showing something off (in which case, it's pronounced like "prevent"), and the effect appears to be using both meanings at the same time
Finally, we have Mogis, God of Slaughter
Suddenly youre playing eight mana, making four tokens, and drawing two cards