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Mega Evolution Series.

The answer changes dramatically depending on which era of Pokemon cards you're looking at

If the blocking creatures power is equal to (or higher than) the attacking creatures defense, the attacking creature dies

Ive seen some crazy sets in my time, but this one takes the cake for the sheer amount of powerful cards in a Standard-legal set

If a land card is chosen this way, return all cards still exiled by this effect to the battlefield under their owners control

Alternatively, just let the turn end, causing Sydris animation to fall off, making Blade of Shared Souls attached to a noncreature permanent, forcing it to unattach thanks to state-based actions