Duelist Challenge #3 :
1) Use Citadel field spell card
2) Use that healing 300LP card
3) use that trap card
4) discard cerberus
5) take back that spell card .
6) use that spellcaster effect .
7) summon cerberus on your side of the field
9) flip summon another monster
10) use again that healing spell card
11) tribute summoned monarch .(use his effect)
12) banish that healing spell card.
13) get that same card on your deck (you draw that card)
14) use that healing spell card again
15) use that cannon spell card.
16) remove spell counters all from citadel and that spellcaster and 1 from cerberus .
17) hit her with all your monster!