Rizulin

Enduring Renewal....

Everyone has suggestions, but here are a few that can help your combo...

1. This admittedly a little costly, but gives you another out, significantly helps you in a multi-player game, and does not break your color scheme.

Pristine Taisman: 3 colorless artifact, abiliity is tap for 1 colorless mana AND gain 1 life.

Near-Death Experience: 3 White, 2 colorless Enchantment, ability is if you have exactly 1 life at the beginning of your upkeep you win the game.

As the last opponent ends his/her turn and you have your 0 life going, tap Prisine Talisman, you have 1 life, your turn starts, game over. 5 mana may be expensive, but if you can clear out multiple opponents without even needing to attack them it can be a huge addition to your combo.

2. If you decide to add black to your deck (you have the Birds of Paradise, maybe sub some lands out for others that produce multiple colors) here are a few cards that can make games a little more interesting.

Repay in Kind: 2 Black, 5 colorless Sorcery, ability is each's life total becomes the lowest life total among all players. This is a huge instant kill if you have your combo going, fantastic in multiplayer (which I play a lot of.)

Another black card that nobody uses is:

Death's Shadow:1 Black, creature, it is a 13/13 that gets -x/-x, where x is your life total. You could get a 13/13 for 1 black mana if your combo is going, and you can easily cover that with just one of your Birds of Paradise.

you can also give Meldira protection from black and use
Pestilence: 2 Black, 2 colorless, Enchantment, ability is for every Black mana spent you do 1 danegae to each creature or player, sacrifice this enchantment if there are no creatures in play. You can wittle everyone's life to 0 while killing all creatures as long as Medira is protected.

And of course you can throw in your Platium Angel.