'Tis better to give than receive, and red mages know this better than most. The infamous Confusion in the Ranks facilitates both, of course, letting any player swap their permanents for another of the same type. Once you've given all your gifts away, isn't that sad, though? You can be even more generous if you take your gifts back, just so that you can give them away again!
That's where Norin the Wary comes in. Whenever anyone so much as sneezes, he's outta there - and comes right back home under your control. But wait, a creature came into play! Better swap him with your opponent's 6/6 demon. There, wasn't that gift exchange fun? I'll give you Norin again next turn, too!
Reinforced Ronin plays a similar role, replacing old standby Glitterfang. Play him for one measly mana to trade with an opponent's creature - then get your Ronin right back into your hand, ready to trade again next turn. Your opponent's board clear? Hey, no problem - just cycle him!
Want a gift that will really leave an impression? The bombastic Bronze Bombshell is sure to make a bang, trading for your opponent's creature (or artifact!) before conveniently disposing of itself and nailing him for 7 big ones. You aren't all about swapping for creatures, of course. There are so many other things to share! Mark of Fury is like Glitterfang for enchantments (you can even play it on your opponent's creatures so they can't two-for-one you!) Use Mana Vault in response to the trigger, getting you three mana and leaving your opponent holding the bag. The artifact lands are particularly saucy - they can swap for artifacts sure, but since they share a card type, you can even swap them for your opponent's lands! Don't mind if I take that Tolarian Academy, do ya?