The Single Card strategy on February 1st entitled "Scyther Trc1188" is
incorrect.

You can use Swords Dance twice in a row but it doesn't do 90 damage.

For example, on your first turn you attach a grass energy and do Swords
Dance = no damage.
On your next turn you attach another grass energy and do Swords Dance again
= no damage.
On your third turn you attach another grass energy and Slash for 60.  NOT
90.

WOTC may have said that you can use Swords Dance twice (and you can) but it
doesn't do 90 damage.