While Thump is greater than its base , it gains dominate and "If this hits a hero, they discard a card." (The defending hero can't defend Thump with more than 1 card from their hand.)

Set: Tales of Aria
Edition: Unlimited
Finish: Regular
Type: Action
Sub Type: Attack
Rarity: Common
Class: Guardian
Cost: 4
Defense: 3
Power: 4

See more from Tales of Aria here