Whenever a creature you control enters, you may pay
We always want to make opening booster packs the most fun experience possible, and we love the excitement that these cards add to cracking open a booster pack
And you are also shooting something for two damage, giving your dork +2/+2, and the protection from Red and Blue increase the chance of hitting for a card quite nicely
If an Adventure spell leaves the stack in any way other than resolving (most likely by being countered or by failing to resolve because its targets have all become illegal), that card won't be exiled and the spell's controller won't be able to cast it as a permanent later
Beyond Magic, why not try out more of the best card games worth adding to your collection
Players love the strong commander cards, while collectors enjoy the unique lands and treasure-themed art