While its great to have constant access to your win condition, it can be risky to rely solely on them to win
Blacklance Paragon 1B Creature Human Knight 3/1 Flash When Blacklance Paragon enters the battlefield, target Knight gains deathtouch and lifelink until end of turn
[EFFECT] Draw cards equal to [the number of monsters revealed to meet the requirement]
Hearts Ace of Hearts Two of Hearts Three of Hearts Four of Hearts Five of Hearts Six of Hearts Seven of Hearts Eight of Hearts Nine of Hearts Ten of Hearts Jack of Hearts Queen of Hearts King of Hearts Diamonds Ace of Diamonds Two of Diamonds Three of Diamonds Four of Diamonds Five of Diamonds Six of Diamonds Seven of Diamonds Eight of Diamonds Nine of Diamonds Ten of Diamonds Jack of Diamonds Queen of Diamonds King of Diamonds Spades Ace of Spades Two of Spades Three of Spades Four of Spades Five of Spades Six of Spades Seven of Spades Eight of Spades Nine of Spades Ten of Spades Jack of Spades Queen of Spades King of Spades Clubs Ace of Clubs Two of Clubs Three of Clubs Four of Clubs Five of Clubs Six of Clubs Seven of Clubs Eight of Clubs Nine of Clubs Ten of Clubs Jack of Clubs Queen of Clubs King of Clubs How many cards are in a deck
And if counters (finality, -1/-1, stun counters) are a problem, Rhys can take them away
Since cEDH tends to be the environment that finds homes for every form of efficient mana acceleration imaginable, Blood Pet is just going to be more valuable in decks tuned for that part of the Commander format than elsewhere