Does Yuna, Grand Summoner's ability trigger when Yuna itself dies?
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The short answer
No, Yuna's second ability only triggers when another permanent you control is put into a graveyard from the battlefield. Yuna's own death does not trigger the ability, so you won't get to tutor or put cards onto the battlefield when Yuna itself is destroyed.
The card

Yuna, Grand Summoner
Legendary Creature — Human Cleric
Grand Summon — : Add one mana of any color. When you next cast a creature spell this turn, that creature enters with two additional +1/+1 counters on it.
Whenever another permanent you control is put into a graveyard from the battlefield, if it had one or more counters on it, you may put that number of +1/+1 counters on target creature.
Illustrated by Kevin Glint1/5
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