If an artifact or creature entering the battlefield causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.

Whenever a creature enters the battlefield under your control, you get {E} (an energy counter). {4}, {T}: Return target creature you control to its owner's hand.

Whenever an artifact enters the battlefield under your control, Reckless Fireweaver deals 1 damage to each opponent.

Whenever you get one or more {E} (energy counters), put a +1/+1 counter on target creature you control. {4}, {T}: You get {E}.

When Spontaneous Artist enters the battlefield, you get {E} (an energy counter). Pay {E}: Target creature gains haste until end of turn.

Flying When Glint-Nest Crane enters the battlefield, look at the top four cards of your library. You may reveal an artifact card from among them and put it into your hand. Put the rest on the bottom of your library in any order.

Temple of Mystery enters the battlefield tapped. When Temple of Mystery enters the battlefield, scry 1. {T}: Add {G} or {U}.

Creatures you control have "{T}: Add one mana of any color."

When Whirler Virtuoso enters the battlefield, you get {E}{E}{E} (three energy counters). Pay {E}{E}{E}: Create a 1/1 colorless Thopter artifact creature token with flying.

Search your library for an artifact card, reveal it, put it into your hand, then shuffle.