The magic sword of the Nelf

Pay 15 life to cast this. Target creature gets +4/+4
for every land target player has.
Creature also has:"every time this creature attacks,
you gain life equal to half of the damage done."
Equip {0}
"I must hit him from a different angle but which one?!
There are so many and with this power, I am sure to
win no matter what!"