Thank you for your response.
Ok I will try to explain it a bit better:
Additional to the other cards, there are the mana cards on the supply. 1 mana costs 2 copper for example.
At the start every player gets 7 copper, 3 estates and 2 mana cards of his colour.
“MtG-Dominion cards” can be bought from the supply. In this case “Flammender Äther”: 4 $.
In the action phase this card may played as an action card. In this case, the player has 1 action and the possibility to say, - if he pays 2 $ and 2 black mana- that he attacks one of his enemy-player with “3 attack” as you can see on it. If the enemy has no defending card, he has not 20 lifepoints now he has 17. He can defend it, if he plays the “Waldharpye”-card. This card has 4 defending points, so the card “Flammender Äther” doesn´t work.
The game ends, if the provinces are out or the enemy has 0 living points.