Anakin can block two different creatures each turn.
Anakin deals double damage to creatures.
+1: Darth Vader deals x damage to target creature, where x is the number of cards in your hand.
0: Darth Vader becomes an x/x colorless creature with hexproof, menace, sear, double strike, and reach that deals double damage to green and/or white creatures where x is the number of loyalty counters on Darth Vader.
-2: Summon target trooper from you graveyard, then summon a number of 1/1 black trooper tokens equal to that creature's toughness.
-12: Summon a number of 1/1 black Trooper tokens equal to the number of Troopers on the field, then you get an emblem that says: During your upkeep, summon x 1/1 black trooper tokens, where x is the number of Trooper tokens on the field.