A 4/4 creature is already big on its own, especially if you arent prepared for it or youre just attacking with a smaller one
Midnight Hunt also offers a few interesting lands, including the transforming land Hostile Hostel , which can sacrifice enough creature to transform into a 3/7 black artifact creature with remarkable abilities, including the ability to phase out
The Commanders for Hail, Caesar are two of my favorite bad guys from Fallout: New Vegas
Fact or Fiction 3
Her -2 filters through the player's deck for cards, like creatures that have their own venture effects
There are also creature-lands like Lair of the Hydra that have an activated ability that animates them into creatures, and some planeswalkers, including Gideon-type walkers like Gideon, Ally of Zendikar and Kaito, Bane of Nightmares, that have activated abilities or triggered abilities that let them become creatures