The cost might be steep, but you'll often be okay paying it, especially in matchups where you would take more damage if the land entered the battlefield tapped
The value of X is calculated only once, as the reflexive triggered ability resolves
If you dont want your opponents creatures, yours still receive some insurance against effects like Path to Exile and Deadly Rollick, which can be extremely helpful if a creature like Avacyn, Angel of Hope is holding the rest of your board together
2014-02-01 Unless some effect explicitly says otherwise, a creature that can't attack you can still attack a planeswalker you control.
Orcish Bowmasters Exxaxl: Hullbreacher enthusiasts rejoice
Collector booster contents vary wildly between sets, so heres what you can expect from a Final Fantasy collector booster as an example: 3 foil commons 3 foil uncommons 1 foil basic land 1 non-foil showcase art uncommon 1 foil showcase art common or uncommon 3 non-foil rares or mythic rares with Booster Fun 1 card from the Through the Ages bonus sheet 1 foil rare or mythic rare that could be a colorful chocobo or a serialized gold chocobo