leyline mtg cards of Sanctity - Wilds of Eldraine: Enchanting Tales - Casting Cost Card Type Leyline of Hope | Duskmourn:

If a friendly non-Angel Dies, Avacyn the Purifier deals three damage to all creatures and opponents

This makes Be'lakor very strong not just when it enters, but also passively throughout the game

Any "as [this permanent] enters the battlefield" or "[this permanent] enters the battlefield with" abilities of the chosen token will also work

Since it was its own sheet, if you got a rare or mythic rare double-faced card, you'd also get a rare or mythic rare single-faced card in the booster

A big contributor to winning games is getting them down early, or with mana to spare, so youll want to figure out how to generate mana beyond what you should be able to at early-to-mid stages of the game