Nightblood

If Nightblood is not equipped, any player may
select a creature they control during their end
step. If it's legendary, equip Nightblood to it.
If not, flip a coin.
Tails: destroy creature. Heads: attach Nightblood.
Damage from equipped creature exiles damaged
creatures along with all counters and cards it has.
Players damaged by equipped creature chooses a
land. That land loses its color identity and all
abilities, gaining "{t}: add {c}"
Equipped creature gains "Echo {e}{e}{e}or{6}"