Forum:Mist Valley infinite life point loop?

there is this lock that my friend uses in his mist valley deck:

it needs only 4 cards: the combo:  eventually he will gain 1000 lp and pay 500 lp, so he will practically only gain 500 lp (1000 -500)constantly as long as he continue with the loop. i don't see anything illegal with this loop, but he can acrually gain infinite life points, so i was wondering if it's legal or not. --190.191.178.38 (talk) 04:18, April 3, 2011 (UTC)
 * Ultimate Offering
 * Spring of Rebirth
 * Mist Condor
 * Mist Valley Shaman
 * first he have mist condor or mist valley shaman on the field, ultimate offering and spinr of rebirth activated.
 * then he returns shaman for mist valley condor's effect (or summon shaman and return mist condor for shaman's effect)
 * he will gain 500 lp for spring of rebirth.
 * he pays 500 with ultimate offering to summon shaman and returns again mist condor. gains 500 again for spring of rebirth
 * then he special summons mist condor returning shaman, gaining 500 lp more.