The card says : "Put a card from your mana zone into your hand. Then put a card from your hand into your mana zone"
The webiste allows you to add the same Siren Concerto you used to mana, which should be impossible, because it's not in your hand anymore when you cast it.
Gives huge advantage, basically you're switching a card from mana with Siren, for FREE, for no cost. There is no such thing in DM, there is always a cost.
Explanation below:
When you cast a spell, it immediately leaves your hand and goes on the stack (to resolve). While it’s on the stack, it is not in your hand, it is no longer a valid target for effects that say “choose a card in your hand.”
The effect says: “Choose a card in your mana zone → return it to your hand. Then choose a card from your hand → put it into your mana zone.” The “choose a card from your hand” can only select cards that are physically in your hand at that moment. Since the Siren Concerto you’re casting is on the stack, it is not in your hand, so you cannot select it.
The card says : "Put a card from your mana zone into your hand. Then put a card from your hand into your mana zone"
The webiste allows you to add the same Siren Concerto you used to mana, which should be impossible, because it's not in your hand anymore when you cast it.
Gives huge advantage, basically you're switching a card from mana with Siren, for FREE, for no cost. There is no such thing in DM, there is always a cost.
Explanation below:
When you cast a spell, it immediately leaves your hand and goes on the stack (to resolve). While it’s on the stack, it is not in your hand, it is no longer a valid target for effects that say “choose a card in your hand.”
The effect says: “Choose a card in your mana zone → return it to your hand. Then choose a card from your hand → put it into your mana zone.” The “choose a card from your hand” can only select cards that are physically in your hand at that moment. Since the Siren Concerto you’re casting is on the stack, it is not in your hand, so you cannot select it.