Ive met almost no Elf decks who would decline this card, especially something like Ezuri, who could tap out for mana, activate twice, and then attack for a billion
When you attack a player with anything, not just Karazikar, you will tap one dork to swing past and it's goaded so it'll tap and attack next turn
He's got a very fun effect, too, which essentially resurrects the creatures he kills as thralls that are 'bound' to him -- when the Krovikan Vampire dies, so do the resurrected minions
Magic players are always finding new ways to innovate, which is what makes the game so interesting
If you thought just giving your creatures flying was good, this gives all your creatures flying, +2/+2, and firebreathing