[Teysa] (EDH / Commander)

This is a flexible list with Teysa as comander, adaptable for games against decks of different power levels.

Strategy:

The deck is built around our comander's ability which causes death triggers to occur 2 times. Mainly these death triggers generate tokens, steal life from our opponents, make us draw cards, or force opponents to sacrifice creatures. On the other hand, Teysa's second passive ability makes our tokens have vigilance and lifelink which allows us to play the deck in an aggro mode and still have blockers to defend ourselves.

How to play the deck:

This list has a medium mana curve so we will always try to start with a hand that has at least one mana rock so we can ramp a bit, and low cost token generating creatures or enchantments. With that in play, we will play commander to take advantage of double death triggers either to generate more creature tokens, draw more cards or ramp more with cards like Pitiless Plunderer, Revel in Riches or Black Market.
There is no need to be afraid of sacrificing creatures because the deck has multiple recursion options such as Reveillark, Phyrexian Reclamation or Victimize that allow us to recover creatures from the graveyard.
Board control is guaranteed with cards like Dictate of Erebos or Grave Pact which force our opponents to sacrifice up to 2 creatures for every one of ours that dies. On the other hand, cards like Teysa, Orzhov Scion and Attrition allow us to sacrifice creatures and eliminate major threats. If we do not draw these cards, or we do not have a token generation engine, the deck includes a few removal spells. I know they are not the best, but I wanted the deck to be original, and I think cards like Hour of Reckoning fit well in this list because we will usually have a board full of tokens that help reduce the cost of this spell.

Win conditions:

1.Stomp opponents with tokens:
This deck is capable not only of generating an absurd amount of tokens but also of boosting them with cards like Cathars' Crusade or Eldrazi Monument.

2.Drain life from opponents:
Cards like Zulaport Cutthroat, Cruel Celebrant or Blood Artist drain life from our opponents every time one of our creatures or tokens dies. Thanks to Teysa this effect is doubled whenever the comander is on the battlefield. In short, we will sacrifice our creatures with any of the sac outlets, we will generate many tokens with it that we will also sacrifice thus draining the life of our opponents to 0. Other cards like Kokusho, the Evening Star are a wincon by themselves, this one for example drains 10 life to each opponent when he dies if our commander is on the board. With cards like Gift of Immortality or Nim Deathmantle we can repeat the process multiple times in the same turn.

3.Liliana, Dreadhorde General:
If the token generation and sacrifice strategy fails, this card can by itself win the game as its -9 ressets our opponents' board completely.

Infinite combos:
I am not a big fan of winning games with infinite combos, however, this list opens up the possibility for several options for infinite mana generation / token generation / drain life from opponents combos. I have included the cards that allow these combos because by themselves are pieces that fit perfectly with the aristocrat strategy of the deck, in addition, my playgroups have decks ranging from low - medium power levels, to high - competitive levels, so I like my deck to be able to at least give a fight to the decks of higher power level and that is why I include the infinite combos. How the combos work?:

Ashnod's Altar / Pitiless Plunderer / Sifter of Skulls + Token on death creature + Nim Deathmantle + Teysa Karlov + LTB drain life trigger:

Simple, we sacrifice to Ashnod's Altar any creature that generates tokens with its death (with Teysa in play, 2 tokens will be generated) generating 2 colorless mana (for instance we could use Doomed Traveler), then we use the ability of Nim Deathmantle to return the sacrificed creature to the battlefield (for this we must have 2 additional mana at the beginning of the combo), we sacrifice the generated tokens, generating 4 colorless mana allowing the process to be repeated infinitely generating infinite colorless mana in the process. If on the battlefield we have any permanent that steals life from our opponents every time one of our creatures dies, we will win the game by draining infinite lives from our opponents. There are several combinations of cards that achieve the same effect.