Zarath, Inferno Architect

When Zarath, Inferno Architect enters the battlefield, choose a number greater than 4.

Whenever you deal damage equal to the chosen number to an opponent or a creature, create two
2/2 red Dragon creature tokens with flying.

{r}{x}{t}: Zarath deals X damage to any target. If this damage is exactly equal to the chosen number, Zarath deals an additional 4 damage to that target
and you draw a card.