These are held at game stores across the world and are a huge part of the Magic community
The full text of these abilities are 'At the beginning of the upkeep of the player who has the initiative, that player ventures into Undercity,' 'Whenever one or more creatures a player controls deal combat damage to the player who has the initiative, the controller of those creatures takes the initiative,' and 'Whenever a player takes the initiative, that player ventures into Undercity.'" One is triggered on "venture into the dungeon," the other is triggered by combat damage and upkeep
Learning how to respond to spells is an important and enjoyable part of Magic
Of course, if you opt to make this your commander, you can craft some absolutely nasty builds that do include Cat synergies
Certification Number 84535834 Card Number 006 Player Charizard Holo Variety/Pedigree CD Promo Grade VG-EX 4
Then theres the additional costs for cards and abilities, but more importantly as graveyard hate