You can't pick the same choice twice in a row from the hero power (so you can't discover a minion every three turns).
Choices from the hero power:
In 1 turn, +2/+2 to left minion.
In 2 turns, gain 2 gold.
In 3 turns, discover a minion of your Tavern Tier
In 1 turn, +2/+2 to left minion.
In 2 turns, gain 2 gold.
In 3 turns, discover a minion of your Tavern Tier