It contains two ready-made 30-card decks, one featuring the fiery Lycanroc and the other with the electric surfer Alolan Raichu
When this creature dies, create a 1/1 green Snake creature token for each +1/+1 counter on it
A mana base can be simple (say, seventeen Plains in an all-white, 40-card 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)
Sometimes, a card is 'suspended' instead of banned
Worst case however this gets killed or bounced and they get their Gearhulk/Titan etc back plus another EtB trigger and you lose
On average, older cards from the late 1990s and early 2000s are worth more as well, though some new cards can be expensive