This is a repeatable effect that can lock an opponent out of dealing combat damage for the entirety of the game
However, given the context, I would keep the Angel and the Tiger
The problem is, Wizards seem bent on increasing the amount of busy-work Commander players have to keep on top of
Card draw is another reward, often connected to paying mana, like with Shanna, Purifying Blade, Well of Lost Dreams, or Dawn of Hope
The Gitrog, Ravenous Ride The Gitrog, Ravenous Ride is one of my favorites from this set, and it shouldnt be too hard to see why
Similarly, a creature card on the battlefield that has been made a noncreature permanent (such as one enchanted with Minimus Containment) will cause this ability to trigger when that card is put into your graveyard