These are typically very old cards because age tends to correlate with scarcity, especially with the Reserved List hanging around
While the effect of making a player lose the game by paying one mana of every color is a nice shortcut, since it requires your opponent to have ten or less life, most of the time you're better off saving that mana for spells since they'll be defeated soon anyways
The crazy thing is that were not even close to done
The sacrificed creature's last known existence on the battlefield is checked to determine its power
When youre ready to finish the fight, Gahiji mass-pumps your teams attackers, too
This card makes that yet more terrifying, that player now has the option to play anything in response to spells, not just the infuriating counter-spells blue is notorious for