Thromok the Insatiable [Planechase 2012] Bird Egg what's the signal to attack

what's the signal to attack

It deals 3 damage instead if you control artifacts named Crown of Empires and Throne of Empires

Set: Starter 1999 Type: Creature — Yeti Rarity: Rare Cost: {2}{G}{G} Sylvan Yeti's power is equal to the number of cards in your hand

saw its perfection

Each Wolf tapped this way deals damage equal to its power to target creature

Thromok the Insatiable [Planechase 2012] Bird Egg what's the signal to attackSet: Planechase 2012 Type: Legendary Creature Hellion Rarity: Mythic Cost: {3}{R}{G} Devour X, where X is the number of creatures devoured this way (As this enters the battlefield, you may sacrifice any number of creatures. This creature enters the battlefield with X +1 +1 counters on it for each of those creatures.)