One of the feature of the new sets of cards from the Riftwatcher edition is they are high mana cards. And this high mana cost equates most of the abilities they provide for the team.
One of my favorite from this batch is the legendary monster Agor Longtail. This card is no cheap costing 15 mana but that is all worth it provided with the abilities it contains.
With one BCX this monster has 11 health, behind the 6 armour and having double attack (melee and magic) PLUS the additional buff and debuff - Flying, taunt and void armour, truly this is a legendary card everyone would want on their collection.
On top of the amazing abilities it has, this card is a dragon card, meaning you could use it together with the other elements.
The mana cost maybe scary but with more and more battles now with high mana ruleset it is perfect particularly with those 50 or more mana battles
When it comes to medium mana battles one of my favorite to partner up with this big boy is the water team and the earth team.
Water with Tide Bitter with reflection shield against those with blast damage when I see the opponent will use water line up plus Merdali Guardian to heal and repair him. Then partner with sneak attackers including Dhamphir Infiltrator with double strike
While with water team I would usually pair it with the 2 healers - Wood Nymph and Goblin Psychic and get the repair from Scavo Heirling. And let him do the work on killing the enemy monster using his double attack.
Here are the sample of my battles with this big guy with high mana and medium mana ruleset.
99 Mana
https://splinterlands.com/?p=battle&id=sl_2f1d1404bd37712a0c12f5f8cc861335
34 Mana
https://splinterlands.com/?p=battle&id=sl_fa919c907400a651650adc6a0cf5e83f
You will see how powerful this card is. With the speed and the flying ability, it caused his enemy to miss and with the heal and repair it was able to live long and give its team the chance to kill the opponent team or he himself would kill them for lower mana battles.