It's also more difficult to pin down a set booster's rarity ratio, with each slot in the pack having its own chance of being a different rarity
for instance, Ghalta, Primal Hungers mana value is twelve, but youre often able to cast it for considerably less, and with Ghalta on the battlefield, Excalibur will cost zero mana
If this card is a 4/4 or bigger, players wont kill it or else they risk giving you 4+ lands
Secondly, in decks with a way to sacrifice a lot of cards for value before bringing them back for another go around
Boros already has this sort of effect attached to a legendary creature you can run in the command zone with Zirda, the Dawnwaker, but its nice to get another one in Gruul with Agatha of the Vile Cauldron
Example: Undead Augur is a great card craw creature, but, before you use it, one of your Zombies needs to die