Food Chain is the main part of a infinite Mana and ETB/LTB combo. Only Legal in the Commander, Vintage and Legacy formats. Great with Commander Creatures that have ETB effects.

This card is a good alternative win-con that unlike normal White win-cons, requires you to lose life instead of gaining it. This card can be used in conjunction with a few different cards to make sure you survive until your life total becomes 1.

Additional Combat phases has become a mechanic that appears in every few sets. With Helm of the Host, those additional combat phases create additional tokens, which an easily create a loop. There are also a couple ways to use this to gain infinite turns.

Thassa's Oracle is one of the most iconic recent combo cards, that required Inverter of Truth to be banned in the Pioneer format. Only requiring a total of 3 Mana to pull off, it's easy to see why it is so strong.

Dockside Extortionist has become a staple in Red Commander decks as a strong ramp piece. Used in the right combos, this goblin can generate infinite treasure tokens.

Since the release of Strixhaven, Chain of Smog has become a strong combo piece by making use of the Magecraft mechanic. By targeting yourself with this card you can copy it an infinite amount of times and trigger the Magecraft abilities infinitely too.