In addition to helping to protect your creatures from your opponent's removal, Rith can populate your board with 4/4 Dragon tokens if you're able to deal extra damage to opponents' creatures or Planeswalkers
When this is on the battlefield, your legendary spells and artifacts have flash
The ability to spend extra mana for extra effect makes it a lot like kicker, and it gives ramp decks in particular something to do with all that excess mana
Playing only spells with a mana value of 3 or higher is a massive drawback and can put you really far behind, especially if you lose the die roll to play first
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