If you have enough mana to cast both, you simply put all of that mana (at least 11 minus the simians in your hand) and float it. Cast the dragon, your stuff disappears, then cast apocalypse. The only problem I see is how are you going to win? Your only creatures of worth are the dragons and you plan on killing them. You need other beaters in there to kill the opponent or, since you already have a lot of mana, a nice fireball or something.
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