He enters tapped and attacking.) Menace (This creature can't be blocked except by two or more creatures.) Other Ninjas you control get +1/+1
A mana base can be simple (say, seventeen Plains in a mono-white Limited deck) or it can be quite complex: featuring multiple colors of mana, lands with unusual abilities, and indirect methods of making mana (via artifacts, creatures, or spells)
Lorcana developers have also stated they plan to never print mechanically unique promotional cards, which is fantastic for players as it removes an otherwise difficult barrier to entry
That might seem redundant, but that also protects it from wither and infect sources of damage, as well as thing the trigger on combat damage to the creature so there is even more going on than at first blush
Thats not all-inclusive, but its a start