Just some ideas.
Hero and Ally Upgrades
Heroes and allies could have multiple upgrade levels which could be earned throughout only campaign/singleplayer online. And I don't mean like 'by getting experience' (that isn't as good in my opinion) but getting it together with the mini boosters at each of your level or getting one depending on the difficulty of the game you played. Getting upgrades should be randomly as it would be fun if it would involve some luck in it so that you can get the one you need. Or if you have all the upgrades for a Hero you do not possess than you buy the hero just for that as maybe it would be stronger than your current hero with less upgrades. Like if you play on easy,you can only get upgrade to level 2,medium for level 3 and expert for level 4.
An example for hero upgrade stages:
Level 1) The original card
Level 2) The original card + x health points/attack/shadow point gain etc
Level 3) Level 2+ Maybe an extra ability or side specialty like flying, stealth or lifesteal etc
Level 4) Level 3 + more extras like in level 2.
( Rank levels could be marked by small stars or some symbols at the side of the card.)
Well just though of this as a way to increase the playhours of single player online, so players won't only pvp once they have the cards.
This could be more applied to heroes than units as units have only a few life points so making it more would be changing it totally,but for heroes it could work? It could only be applied to units if their health and attacks would be in tens or hundreds. Also once a card is upgraded,upgrade will stay till it is removed/card is sold.
Cards with upgrades on shouldn't be able to be sold/traded.
Landscapes
As now we can see a world map and lot of different types of landscapes such as lakes,rivers,forests, and mountains... It could have some affects on the way you battle.
For example:
* Forests: 50% chance to dodge attack for allies who stay in the cover of the forest. Forest could cover half ( right side) of the battleground so that you need at least around 4 allies to get the 4th one into the forest.
* Rivers: If it goes from south to north separating left and right side of the battlefield,then allies only on the same side could attack each other. But of course archers(and other missile units/spells) could attack the other side too.
* Lakes: Allies that get to be inside the lake cannot attack(this would limit the amount of usable allies you can deploy and avoid spamming of allies. Of course maybe with upgrades such as I mentioned above,some creatures could walk on water and wouldn't get affected by this.
This is what I came up with for now
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