Summoning Trap

four generic mana one green mana Instant — Trap

If a creature spell you cast this turn was countered by a spell or ability an opponent controlled, you may pay zero mana rather than pay this spell's mana cost.

Look at the top seven cards of your library. You may put a creature card from among them onto the battlefield. Put the rest on the bottom of your library in any order.

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Showing Zendikar#184

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Summoning Trap rulings

2009-10-01
You may ignore a Trap's alternative cost condition and simply cast it for its normal mana cost. This is true even if its alternative cost condition has been met.
2009-10-01
Casting a Trap by paying its alternative cost doesn't change its mana cost or mana value. The only difference is the cost you actually pay.
2009-10-01
Effects that increase or reduce the cost to cast a Trap will apply to whichever cost you chose to pay.
2009-10-01
If there are seven or fewer cards in your library, you'll look at all of them.