"They play by spitting fire at each other. Don't be offended if one gives you a love-scorch."
—Esfir, Rakdos dragon wrangler

Hellkite Whelp

Flying
Whenever Hellkite Whelp attacks, it deals 1 damage to target creature defending player controls.

Foundations Jumpstart

Guilds of Ravnica

If a creature attacks a planeswalker, that planeswalker’s controller is the defending player.

In a Two-Headed Giant game, Hellkite Whelp’s triggered ability can target only a creature controlled by the player it’s attacking. It can’t target a creature controlled by that player’s teammate.