Siege cards are generally only good if the front face of them is worth playing, and Invasion of Regatha justifies itself by having some of the highest direct damage a three-mana spell can afford
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This can also copy activated abilities too, which can help you draw extra cards from Dreamstone Hedron, for example
Phoenixes often synergize with strategies that involve discard, self-sacrifice, or direct damage, making them a natural fit for decks that thrive on aggression and resource recovery
Even better, it has the Hideaway ability, letting you dig five cards deep into your deck and tuck away a spell, ready to cast it for free later when you meet a particular criteria: in this case, having three creatures with different powers after you tap Collector's Cage