Every Collector Booster contains two foil-etched legends: one common or uncommon and one rare or mythic rare
To solve problems in multiplayer, basically
Unearth is a great mechanic, allowing you to temporarily recur a creature, but only once
For each creature that died this way, put a creature card from the graveyard of the player who controlled that creature the last time it became blocked by that Wall onto the battlefield under its owner's control
Anyways, you also want to take the time to chop out Sulfurous Springs, Sunken Ruins, Underground River, Shipwreck Marsh, Haunted Ridge, Drowned Catacomb, Stormcarved Coast, Graven Cairns, and Cascade Bluffs
Its very rare that I take this into account when building or playing my decks, so the fact that Im taking the time to specifically call Opposition Agent out should speak volumes