It introduces a small incentive to a game to encourage attacking, but still gives players decisions to make
Given the generally low mana-curve in Modern, cards exiled with the pirate monkey will usually be castable with the help of the Treasures and almost any card is worth playing as it simply generates card advantage
Its real value is in some choice staples and your ability to build upon them
One thing not to underestimate about casualty is that only half of the effect will be stoppable by a regular counterspell, which gives the casualty spells in general some added reach in metagames heavy on counters
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Time Sieve is a good one here because it lets you play two extra turns