Gostrin, Drakon of Raid

At the end of your combat step, if you control three or more dragons, draw a card.
Scaleborn 4 - Whenever Gostrin attacks, search your library for four dragon cards with converted mana cost five or less, put those cards onto the battlefield, tapped and attacking. At the beginning of your end step, put those cards into your hand, (Even if they are not on the battlefield.)