Gandalf the White - [Borderless Poster] The Lord of the Rings: Tales of Middle-earth (LTR) GTC That creature gains haste until

That creature gains haste until end of turn

Whenever a creature dealt damage by Zurgo Helmsmasher this turn dies

Keranos isn't a creature

if you had another creature enter the battlefield under your control last turn

Whenever an opponent gains life

Gandalf the White - [Borderless Poster] The Lord of the Rings: Tales of Middle-earth (LTR) GTC That creature gains haste untilFlash You may cast legendary spells and artifact spells as though they had flash. If a legendary permanent or an artifact entering or leaving the battlefield causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.