For example, this means that normally, if you control Hunting Velociraptor, you can cast Grim Giganotosaurus for its prowl cost only if a Dinosaur dealt combat damage to a player, but if an effect causes the spell to have other creature types, the prowl ability is also satisfied by a creature with those additional types having dealt combat damage to a player
This kind of event is something that would appear on MTGRocks as news
Additionally, the damage prevention helps out against the many decks in the format that run The One Ring, like Red Stompy and Mystic Forge Combo
Dramatic Reversal + Isochron Scepter is an easy one (infinite mana + draw)
You can feel safe with just a poxy Mentor in play when you pass, have them cast two or more things at end of turn, untap and cast a bunch more non-creatures and just kill you
How about one card