No injection molds and light weight hollow bodies
Dont get me wrong, its absolutely worth two mana to get back a creature in most situations, but cheap is not free, and we might want to keep our average mana value down so we can afford to use Terra while playing other cards
You can produce a 4-color identity for your deck with pairings like these examples: Red, white, black, and green with Akiri, Line-Slinger + Reyhan, Last of the Abzan White, blue, black, and green + = Ishai, Ojutai Dragonspeaker + Ikra Shidiqi, the Usurper #16
Illustrated by Leonardo Santanna
Flexibility is good, and you also always get to surveil 1 on ETB, too
When Giant Oyster leaves the battlefield or becomes untapped, remove all -1/-1 counters from the creature