Cadric, Soul Kindler | Aminatou, the Fateshifter | Cabal Coffers

Cards

({2} magic symbol) ({W} magic symbol) ({U} magic symbol) ({B} magic symbol) available.

Cast
Aminatou by paying ({W} magic symbol) ({U} magic symbol) ({B} magic symbol) .
When
Aminatou enters the battlefield,
Cadric triggers.
Holding priority, activate
Cabal Coffers by paying ({2} magic symbol) and tapping it, adding at least ({B} magic symbol) ({B} magic symbol) ({B} magic symbol) ({B} magic symbol) .
Resolve the
Cadric trigger, causing you to pay ({1} magic symbol) to create a token copy of
Aminatou.
Activate
Aminatou's second loyalty ability by removing a loyalty counter from it, blinking
Cabal Coffers.
Activate the token
Aminatou's second loyalty ability by removing a loyalty counter from it, blinking the nontoken
Aminatou.
Repeat from step 2.

Once you have infinite mana, you can blink other permanent(s) instead. If those permanents are legendary, you can copy them via
Cadric.

Infinite LTB.
Infinite ETB.
Infinite black mana.
Infinite landfall triggers.
Infinite blinking of permanents you control.
Infinite mana permanents you control that enter the battlefield untapped can produce.
Infinite copies of legendary permanents you own in play until end of turn.