Classic Sixth Edition

Tariff

Each player chooses a creature with the highest converted mana cost he or she controls, then pays mana equal to that cost or sacrifices that creature.

Each player sacrifices the creature they control with the highest mana value unless they pay that creature's mana cost. If two or more creatures a player controls are tied for highest, that player chooses one.

Weatherlight

Each player chooses a creature with the highest total casting cost he or she controls, then pays an amount of mana equal to that creature's total casting cost or buries the creature.