Tax Keeper is a uncommon Creature — Elf Advisor card from Magic: The Gathering (Unknown Event, UNK).
Uncommon
Unknown Event (UNK)
{1}{G}
Power / Toughness
1 / 1
Mana Value
2
Colors
G
Card Text
Tax Keeper gets +X/+X, where X is your highest commander tax among your commanders. (For example, if you've cast your one commander from your command zone twice, it gets +4/+4.)