Ecstatic Electromancer

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Whenever this creature enters or attacks, you may discard a card. If you do, draw a card.

Leaf-Leap Guide

Vigilance
Whenever another creature you control enters, Leaf-Leap Guide and that creature perpetually get +1/+1.
{1}, {T}: Return another target creature you control to its owner's hand.

Mothlight Processionist

Enchantment spells you cast have convoke.
Eerie — Whenever an enchantment you control enters and whenever you fully unlock a Room, conjure a card named Mothlight Processionist into your hand. Discard that card at the beginning of the next end step.

Stormforged Armor

Equipped creature has "Whenever this creature attacks, conjure a card named Ball Lightning onto the battlefield tapped and attacking."
Equip—Pay 3 life.

Forgeborn Phoenix

Flying
Equipped creature has flying.
Whenever Forgeborn Phoenix or equipped creature dies, it perpetually gains "Whenever an equipped creature you control deals combat damage to a player or planeswalker, return this card from your graveyard to battlefield tapped."
Reconfigure {R} ({R}: Attach to target creature you control; or unattach from a creature. Reconfigure only as a sorcery. While attached, this isn't a creature.)