Samut, the Tested

[+1]: Up to one target creature gains double strike until end of turn.
[−2]: Samut deals 2 damage divided as you choose among one or two targets.
[−7]: Search your library for up to two creature and/or planeswalker cards, put them onto the battlefield, then shuffle.

Amonkhet Remastered

+1: Up to one target creature gains double strike until end of turn.
−2: Samut, the Tested deals 2 damage divided as you choose among one or two targets.
−7: Search your library for up to two creature and/or planeswalker cards, put them onto the battlefield, then shuffle your library.

Hour of Devastation Promos

Hour of Devastation

+1: Up to one target creature gains double strike until end of turn.
−2: Samut, the Tested deals 2 damage divided as you choose among one or two target creatures and/or players.
−7: Search your library for up to two creature and/or planeswalker cards, put them onto the battlefield, then shuffle your library.

If Samut's second ability has two targets and one becomes an illegal target, the remaining target is dealt 1 damage, not 2.

While resolving Samut's last ability, all of the creatures and planeswalkers put onto the battlefield this way enter at the same time. If any have triggered abilities that trigger on something else entering the battlefield, they'll see each other.

You divide the damage as you activate Samut's second ability, not as it resolves. Each target must be assigned at least 1 damage. In other words, as you activate the ability, you choose whether to have it deal 2 damage to a single target, or deal 1 damage to each of two targets.