You may make a different choice for each non-Human creature you controlthat is, you may have none, some, or all of those creatures assign combat damage as though they weren't blocked
You can feel Safer Sephiroth taking your life force away
You can check your album at any PC, to see what cards you're missing, while at any time, you can pause the game and check your card collection out, seeing how many cards you have of each specific card.
Loot, Exuberant Explorer, Bloodbraid Challenger, Ilharg, the Raze-Boar, and Emergent Woodwurm are all great at sneaking creatures into play without even paying for them
Only a Stratus Dancer megamorph
It won't trigger again if you spend another four mana to cast spells later in the turn