Players in modern have access to one of the most broken combos in MtG, which includes Phyrexian Unlife and Solemnity enchantments. This combo makes players completely immune to any damage.
However, in pioneer, Phyrexian Unlife is not legal, so players never had the chance to test the combo. That changes with Nine Lives in Core Set 2021.
Nine Lives also has the advantage of Hexproof, which protects it from removal spells.