SD20-JP Structure Deck Lost Santuary - Chapter of Jupiter...

Agent Of Miracle - Jupiter

１ターンに１度、自分の墓地に存在 する「代行者」と名のついたモンスター１体をゲームから除外して発動する事ができる。自分フィールド上に表側表示で存在する天使族・光属性モンスター１体 の攻撃力は、エンドフェイズ時まで８００ポイントアップする。また、フィールド上に「天空の聖域」が表側表示で存在する場合、１ターンに１度、手札から天 使族モンスター１体を捨てる事で、ゲームから除外されている自分の天使族・光属性モンスター１体を選択して特殊召喚する。

Once per turn, you can remove from play 1 "Agent" monster from your Graveyard to select 1 face-up LIGHT Fairy-Type monster you control. It gains 800 ATK until the End Phase. Once per turn, if "The Sanctuary in the Sky" is on the field, you can discard 1 Fairy-Type monster from your hand to select 1 of your removed from play LIGHT Fairy-Type monsters, and Special Summon it.

ATK 1800 / DEF 1000

And here comes some stupid loop again...

1) You need to have "Santuary Of The Sky" on your field.

2) Normal Summon this card, your graveyard need to have 2 more of this same card.

3) Activate its 1st effect, removing from game 1 copy of this card to increase its own attack to 2600.

4) Use the 2nd effect of this card, discard 1 Fairy monster from hand to special summon the 1st copy that got removed from game by this effect.

5) Use 2nd copy's 1st effect, removing from game the 3rd copy in grave, increase own attack to 2600.

6) Use the 2nd effect of the 2nd copy of this card, discard 1 Fairy monster from hand to special summon the 3rd copy that got removed from game by this effect.

7)  Use 3rd copy's 1st effect, removing from game 1 agent monster in grave, increase own attack to 2600.

8) Use the 2nd effect of the 3nd copy of this card, discard 1 Fairy monster from hand to special summon the last Agent monster that got removed from game by this effect.

Result: 3x 2600 ATK monster (Till end phase...x_x|||) + 1 random Agent monster (usually Agent of Creation - Venus...) 

Fairy OTK anyone?

And also... getting it to graveyard is easy with Lightlord's mill engine.