Many other cards have been printed with altered versions of this ability, such as Vedalken Shackles, but Old Man of the Sea is the first
Either as a last-ditch protection spell on defense or a finisher on offense, being able to windmill slam this for zero mana was certainly a huge play
In Giselas case, thats double damage for any source damaging opponents or their permanents, and incoming sources of damage halving, rounded up
Its still great with Siege-Gang Commander, but no one cares about a 2/2 haste, and most of your Goblins dont benefit all that much from cost reduction or haste
Ain't no spotlight in town that ain't eyein' Kitt, and she dang glows in 'em
A turn 5 play on turn 4 is nice, but a turn 4 play on turn 3 is still a big deal in its own right