Eldrazi Displacer + Ashnod's Altar + Patagia Viper

Eldrazi Displacer

Ashnod's Altar

Patagia Viper

How it works

1. Activate Eldrazi Displacer by paying 2C, blinking Patagia Viper.
2. When Patagia Viper enters, its first and second ability trigger.
3. Resolve the first trigger, creating two creature tokens.
4. Holding priority, activate Ashnod's Altar by sacrificing two creature tokens, adding CCCC.
5. Repeat.

This loop transforms the blink engine of Eldrazi Displacer into an infinite token and mana generator by leaning on the persistent support of Patagia Viper and Ashnod's Altar. Each time the Viper is blinked, its entrance triggers the creation of two 1/1 Snake tokens, which you immediately feed to Ashnod's Altar to generate four colorless mana. Since Eldrazi Displacer only requires three of that mana to repeat the process, you are left with a steadily growing surplus of colorless mana, endless creature deaths, and as many enters-the-battlefield triggers as you could possibly want. Notice that you conveniently sidestep Patagia Viper's built-in sacrifice clause because it enters the battlefield via blinking rather than being cast from your hand, letting the swarm multiply completely unchecked.