Casting Cost: Card Type: Creature - Otter Wizard Power / Toughness: 1 / 1 Card Text: Haste Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.) Instant and sorcery spells you cast cost less to cast
Al Bhed Rescuers is likely going to see Commander play
Some are easier to achieve than others, but they all require some level of precise deckbuilding to work
Finally, when Slinza or any other creature with a power of four or more comes into play under your control, you can pay two mana to have Slinza fight another creature
The good news is, paying 4 for this is pretty awesome, and thats fairly easy to do in a Blue-White deck
At the beginning of your end step, if a player controls no creatures, sacrifice Sothera, then put a creature card exiled with it onto the battlefield under your control with two additional +1/+1 counters on it