The sweet spot here is playing a creature with mana value seven or higher, as that card gets three +1/+1 counters and gains haste
Alternatively, it can hop around on utility creatures that tap, while goading attackers, as it gives a consistent goad trigger, and card advantage with Killian
Ensnaring Bridge Ensnaring Bridge reminds me of Lantern Control in the Modern of yesteryear good times
Ephara generates card advantage by having creatures enter the battlefield, which means most of your creature base are creatures with ETB effects and ways to flicker them
I really enjoyed playing this card on Arena in decks that included cards like Awaken the Honored Dead, Fangkeeper's Familiar, and Rakshasa's Bargain, as ways to fuel the graveyard and get value off of it
Target opponent loses 5 life unless that player discards two cards or sacrifices a creature or planeswalker