You remove a counter to fire upon your own siege engine, and Gatta and Luzza turns that damage into a new counter instead
There were four warriors-matter cards in Khans of Tarkir (all in WB) and four Gates-matter cards in Guilds of Ravnica (one blue, one Boros, and two artifacts, which makes sense considering its the play-all-the-colors archetype)
His abilities synchronise perfectly play vampires and get extra vampires, and, when the time is right, cast him, attack with haste, and make your whole army grow
It steals your opponents monsters, then any time to try to destroy the card it can simply get rid of the monsters it stole
banish 1 random face-down card from your Extra Deck, and if it is a Link Monster, Special Summon this card