Pelagic Guardian

Position 1 — Pelagic Guardian can block an additional creature. (If in position 1 on upkeep, gain this effect. You can change positions only once per turn on main phase.)
Sacrifice Pelagic Guardian: Target non-human creature you control gains indestructible until end of turn.
"Guardian of the abyssal depths, its armored presence shields secrets untold." — the Ancestor