You can construct a powerful card advantage engine when you stack that token production with cards like Elemental Bond and Ohran Frostfang to enhance Disas best qualities
They mesh well with mechanics like foretell and plot that help to set up explosive double-spell turns
Theres a lot of sacrifice fodder available to throw -1/-1 counters around, and the proliferate ability can help you to speed up sagas, kill bigger creatures with the previous ability, and grow some of your own creatures
The ability is strong, has a sufficiently high mana value that its easy to get a mana advantage by Exploiting most creatures, and Sidisi is expensive enough that youve probably got a creature to sacrifice
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Decree of Pain - The great thing about this card is it can be a small (token) board wipe while netting you one card, or it can get rid of everything while filling your hand and then some