I wonder if the following statements are correct:
- Cards put into play this way cannot be countered in an ordinary way; such as with cards capable of countering summoning spells, such as Remove the Soul, or with a generic counter such as Cancel when summoning a creature by paying the mana cost, as usually happens.
- It is possible to counter the respective activated abilities of the two cards above - for example, in the case of Quicksilver Amulet, with Rust; or in the case of Sneak Attack, with Trickbind.
Countering the activated ability in such a way will prevent the “putting into play” of creatures, even when is explicitly reported on their card text the phrase "[this creature] can't be countered", like Kavu Chameleon, or Emrakul, the Aeons Torn.
- If Emrakul is put into play with the ability of Quicksilver Amulet or Sneak Attack, the text of the card that reads "When you cast this spell, take an extra turn after this one" will not apply, so the player who puts Emrakul into the game will not be able to have an extra turn, since he has not materially "cast" it.