Here are some hints of things to come in Tides of War:
Strategy cards introduce scenarios that stay in play for a limited time -- based on an initial investment. Here's one for the Daemons:
Battle of Black Blood: If a creature deals capital damage, destroy it.
Tides of War also introduces Blessings that rely on specific kinds of scenarios to be in play (the scenarios are all being subtyped). So, for example, there's:
Airborne Fury: While Airborne Fury is in play the attached creature gains +X Damage, where X is the number of Mountains in play.
Tides of War also introduces a new passive card ability, Rally. This is how it works: When this Creature comes into play, reveal the top card of your deck. If that card is a Creature, add it to your hand. So, for example, there's the new Keebo:
Eager Hatchling -- 3 res, 3/3/2/4, with Swarm and Rally
Tides of War also starts to introduce the new factions that will be properly unveiled in Dark Alliance, including the Argurians, Dankari, Ratmen, Kjen, Undead and Ionians. While none of them will be playable as a whole, Faction based deck quite yet, you'll start to get a sense of what they're all about.
Check out the new event, Consul of Rats: 0 res, Shuffle your graveyard into your deck.
More to come!