Engineered Plague vs slivers

[zappon]

if my oponent drops down an engineered plague and choses "slivers" if in the next turn I put into play the muscle sliver what hapens? does my sliver goes directly to the graveyard or the abilitie has efect?if i have sliver queen in play during my oponent attack phase can i block one of is creatures, creating a token 1/1 using the ability of the queen, and knowing that Engineered Plague turn my creature into a 0/0?can a 0/0 creature block?wen do creatures go to the graveyard?in the end of whitch phase?

  (forgive my english)

[Jebus]

Your Muscle Sliver comes into play.

Simulatneously, two continous effects are altering it's power and toughness.  One giving +1/+1, and another giving -1/-1.  The essentially cancel each other out.  By the time state-based effects are checked, your Sliver is a 1/1 and remains in play.

Regarding your Sliver Queen question, unless you've got that Muscle Sliver in play or something similar, your Sliver Queen's tokens are worthless.

They will come into play as a 0/0 and be immediately put into the graveyard when state-based effects are checked.

State-based effects are check every time a player would get priority, so the tokens are put into the graveyard before you can do anything with them.