Loena (V1.55, Vendetta Update)

Leona is a deck that shines with a slow, hold-based playstyle, focused around building up your board and locking down battlefields. Waiting two or even three turns to push up to a battlefield can often be one of your best choices.

The best Chosen Champion for your deck depends on your playstyle, but I prefer to keep Zealot as my CC. She acts as a pseudo-accelerate unit late game, and an excellent source of Might reduction in a deck that can struggle against large bodies. Determined struggles to find a spot among Sett, Vi, and Sona, but certainly can be used as a way to get onto battlefields.

Zenith Blade is one of the best Signature Spells in the game, getting us both a stun and Action-speed movement. Its best used with Zealot, as a tool to defend batlefields. It can be used as a regular stun if absolutely needed, but is better saved for its movement.

2-Drops:

Scuttle Crab is a fantastic way to get some draw and hand info from your opponent. Unfortunately, it doesn't help us hold very well, but the advantage we get for playing+killing it makes up for the lack of Might.

Lonely Poro also fills the draw role, but does lose value during the late game, as it doesn't find a way to die alone very often.

Daring Poro is a 3 Might on attack, mostly being in the deck just to take a battlefield if absolutely needed.

Stalwart Poro is a 3 Might on defense, helping you hold a battlefield.

3-Drop:

Nami is one of the best units we have received. She does have a stun available for an additional cost, but I do not often find myself using the ability. More important to us is her Hold effect, which makes the next unit you play enter ready with a buff. This is huge for building up your board to take another battlefield, and getting Sett another unit with a Buff. She is a high value target however and is within Falling Star range, meaning she can die relatively easily.

4-5 Drops:

Sett is one of your best units, as he is slightly overstatted, and gets +1 Might for each buffed unit at his battlefield, including himself. Having just two buffed units makes him 7 Might, and if he is one of those units, he becomes 8 Might. He can quickly build up and protect your squishier units with his [Tank] keyword.

Sona enables you to more freely play your units and spells, since she readies 4 of your runes at the end of your turn. She lets you play Heroic Charge, Back Off, or even a Vi much easier during your opponent's turn. She is a high value target for your opponent however, so she is best played when you can protect her.

Vi is a very useful combat trick, giving you a free Reaction-speed stun when she attacks, and providing a 5 Might body.

Finishers:

Zealot is a very good finisher, reducing stunned units Might by 8. This lets you beat over strong units like Watcher and Fiora Peerless. She also has the bonus of being a unit that can enter ready in the late game, enabling you to take a second battlefield with relative ease.

Harnessed Dragon is a unit best suited for single, large Might decks, like Master Yi or Aurora decks. It lets you kill a unit when it's played, without needing to enter combat to do so. However, it struggles against swarm style decks and ends up being too expensive for its effect.

Vilemaw is the opposite of HD, being great against low might swarm decks, but struggles against large Might decks. Placing it at a battlefield with Reaction speed can completely lock your opponent out of combat, and let you win against Viktor, Rek'sai, and Darius decks.

Stun spells like Back Off and Heroic charge serve to help us to protect our units, and are often better on defense, rather than offense.