Azorius Flicker
Bounce those ETB creatures for double value.

Dimir Control
Lots of removal, card draw and distruption.

Rakdos Aggro Aristocrats
Sacrifice for value.

Gruul Aggro
Ramp to summon big creatuers.

Selesnya +1/+1 Counters
Lots of different counter enablers to grow big creatures, and spells to protect them.

Orzhov Midrange
Lifedrain with plenty of soft and hard removal.

Izzet Spellslingers
Evade, counter, and burn.

Golgari Graveyard Value
They never die.

Boros Aggro
Effective and cheap creatures with several spell tricks.

Simic Tempo
Evasive threats and interaction, with growing creatures.