Seeing the danger that Yargle was in, she sent a plea for assistance to her father
Also of note, if your opponent had cast Shock after they declared blockers but before the combat damage step, your Troll would be removed from combat and no damage would be dealt, leaving their Rats unscathed
Meanwhile, the creature Solemn Simulacrum is a classic card in not only Commander (where it's good for mana fixing), but also in blue Tron builds
Her +1 is not that useful in T4, but her -2
Consequently, Inquisition of Kozilek basically ends up functioning as Thoughtseize, without costing you the additional life loss
[1] The Card Reprint Policy featuring the Reserved List was first published by Wizards of the Coast on March 4, 1996, in response to concerns that reprints were diminishing the value of cards as collectibles