For example, say you've cast two spells this turn, and with Murmuration's last ability on the stack, you cast a Blizzard Strix (a Bird creature spell with flash that may have been chosen for this example due to being an adorable owl)
Land Color tag templates(None) Forest Basic Land - Forest Color tag templates(None) Gruul Turf This land enters tapped
Legendary Planeswalker - Karn Color tag templates(None) Planeswalker (CTRL to add secondary) Sorcery Qty: 19 Price: 150.52 Awaken the Erstwhile Each player discards all the cards in their hand, then creates that many 2/2 black Zombie creature tokens
It's important to note that even if you are able to hit an opponent with several Dragons at once, you'll still only be able to goad one of their creatures
Energy was introduced in the Kaladesh Block, and basically hasnt been since outside of the MTG Arena-specific set Jumpstart: Historic Horizons
While it's more than likely you won't be able to attend an in-store Prerelease event, many stores will still have these available for sale and for at-home Prereleases