If the Army creature you chose isn't already a Zombie, it becomes a Zombie in addition to its other types
Menace is a specific type of static ability called an evasion ability , which means a creature increases its odds of damaging a player by evading other creatures that can block it
It also has a unique ability where you can tap it, pay one white and one blue mana, and sacrifice a Bird creature to draw a card
So, lets go over how you can sacrifice a few cards for that extra bit of flair in Pokmon TCG Pocket
Then the recently printed Offering costs two too, also sacrifices both, and this time leaves you a Map token to either draw the top land of your library for a three for one, or give a dork a +1/+1 counter
Often, these payoffs include cards with Delve, allowing you to cast them for much cheaper to free by exiling cards out of your graveyard to discount it