Both Tidus, Yuna's Guardian and Yuna, Grand Summoner play around with +1/+1 counters, but both are templated in a way that works with any kind of counter
Anikthea is amazing as a commander because she takes the often value-oriented enchantress game plan draw cards, maybe build a pillow fort and drives the aggression up from zero to 60, all while still generating value
In exchange, Ursula gets Ariels voice, which she traps in the Shell
$1.79 Chandra, Torch of Defiance Emblem // Wizard Token Commander Masters $0.35 Thrill of Possibility Foundations $2.79 Runaway Steam-Kin Guilds of Ravnica $1.29 Risk Factor Guilds of Ravnica $5.99 Torbran, Thane of Red Fell Throne of Eldraine $2.79 Chandra, Legacy of Fire Commander Masters $0.99 Chandra, Flameshaper Foundations $0.69 Emblem (Chandra, Torch of Defiance) Kaladesh $0.49 Chandra, Fire Artisan War of the Spark $0.79 Chandra, Acolyte of Flame Core Set 2020 $12.99 Untimely Malfunction Duskmourn: House of Horror $4.49 Chandra, Hope's Beacon March of the Machine 0 results found
It isnt a direct replacement for Phyrexian Altar, but it is a neat little backup with its own set of advantages and disadvantages
A flash Bitterblossom lets you hold up countermagic and helps play around sorcery-speed removal