The ability is always useful, name a time you wouldn't want to put an extra land down, scry, or draw a card
"Put on another creature you control" includes creatures other than Benevolent Hydra that enter the battlefield with +1/+1 counters on them
Since you're in green, however, you'll likely have access to plenty of mana, oftentimes enough to pay the cost of Summoner's Pact and cast whatever creature you grabbed from your library
Let us review in detail the proess of casting Angel of Salvation with the alternative cost of Fist of Suns when we control Silverblade Paladin, Bloodbraid Elf and Nivmagus Elemental
However, say you have a creature, artifact, enchantment, and land card in your graveyard, you'll be able to search for any land or creature card instead
As well as a permanent way to copy recently cast Wizards, Inalla also has a win-con stapled on, so long as you have the ability to untap or blink your Wizards