Casualty 2 isnt a high threshold, but the fact that Anhelo himself cant sacrifice to this effect is a real and significant drawback to this cards long-term popularity and playability
At 6/6, he has a decent body, but his most important trait is making spells cheap to cast as long as there are land cards in the player's graveyard
[-3]: Creatures you control gain trample and get +X/+X until end of turn, where X is the number of creature cards in your graveyard
Following the release of Premodern as a sanctioned format on Magic Online and a major event at Lobstercon, the format is really picking up
Naturally, some of these references are about key major story points in their respective Final Fantasy titles
They have an effect that gets bigger the more mana you use to cast them, so the first time you cast one the effect is tied to the regular casting cost