mtg eldrazi commander precon Incursion Full Deck Reveal! There are also some surprises in store Magic : The Gathering Modern

Impending N[cost] means You may choose to pay [cost] rather than pay this spells mana cost, If you chose to pay this permanents impending cost, it enters with N time counters on it, As long as this permanents impending cost was paid and it has a time counter on it, its not a creature, and At the beginning of your end step, if this permanents impending cost was paid and it has a time counter on it, remove a time counter from it. Casting a spell for its impending cost follows the rules for paying alternative costs in rules 601.2b and 601.2fh.

Im not going to parse out the best or worst ones here, but they all kind of fit the description

The Mage blinks, re-enters the battlefield copying Cloudshift again

Cast Crucible of Worlds or Ramunap Excavator and call it good

Blue (U) seeks perfection through knowledge, and represents logic, caution, and deceit