Plan A for the deck is to amass a legion of Goblin creatures and give them combat-oriented buffs such as haste, menace, and power/toughness boosts to overwhelm any opponent who isn't ready for such an assault
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Unlike N, Ace Trainer will always grant you a full six cards after you shuffle your old hand back, and will always leave your opponent with a new hand of only three cards
in Magic, restrictions trump obligations, so defender essentially overrides goad, and the goaded defender will simply not attack during combat
Things get a bit weird past that point because this particular tutor cares about mana value
It has been printed as a rare in most products and was once an uncommon, but now it's a mythic rare in Commander Masters