The thing is, it transfers the four negative counters when it dies, which is usually good enough to kill a creature
Summon: Anima I looked at Summon: Anima and immediately thought of Peasant Cube
These abilities are universally useful
Orcs are aggressive creatures, with abilities and stats to match
That's a great way to cast any legendary creature, and for other spells, Delighted Halfing can simply tap for one colorless mana so it's not restricted to casting legendary creatures
First, they boosted the power and toughness bonus it granted, then dropped the cost to only one mana to cast and equip, and finally made it so it gave the creature 1 toughness, and it ended up being that fateful 1 that made Skullclamp into a monster, since all you had to do was play one-toughness creatures and you suddenly had a repeatable, colorless, one-mana Divination