For Amulet of Vigor's ability to trigger, a permanent must enter the battlefield tapped due to an effect that says "put [the permanent] onto the battlefield tapped," "[this permanent] enters the battlefield tapped," or the like
However, they are rare drops, with low offering rates
He summons "Sand Warrior" tokens, which is a lot more interesting than the very boring effects that so many of these other characters do
Naturally, you can share this stuff with other players, but it doesnt stop there
Then theres Savage Punch, Primal Might or Hunt the Hunter, that let you pump your creatures before going into the fight
Think about being sat across from a deck using Food and Clues, tapping some for mana, cracking some Treasure