underground sea mtg card Proxy Island Swamp. Underground Sea - Summer Magic

These are all fairly pricey due to their sheer scarcity, but Command Tower takes the top spot among them

310.8d If a battles protector is a different player than its controller, all rules and effects that refer to the defending player relative to a battle that is being attacked refer to that battles protector rather than its controller

When mixed with the already fantastic slew of red burn spells, you have a very formidable deck

The effect is mostly the same, but the "same name" clause is limited to the one player, unlike Sphere which effects all players

The symbol itself shows which set the card belongs to, and its color indicates its rarity