Feast of Sanity + Marina Vendrell's Grimoire: infinite combo for €0.24

The pitch is simple: for 24 cents you get a repeatable game-ender that requires no board setup, just a full hand and patience until the cleanup step.

The mechanism

The combo exploits a trigger loop during the mandatory discard phase, not the main phase. That matters for bracket purposes: it's slow to get going (you need to reach cleanup with a hand over the limit), but once it starts it's a mill/burn loop the table struggles to interrupt in response.

Step by step:

• During your cleanup step, you discard down to your maximum hand size.
• Feast of Sanity triggers once for every card discarded this way — if you discard 3 cards, you have 3 triggers on the stack.
• Resolve the first Feast of Sanity trigger: 1 damage to any target, you gain 1 life.
• This is where Marina Vendrell's Grimoire comes in: the life gain triggered by Feast of Sanity converts into the engine that loops the sequence back around, letting you repeat the damage without consuming further resources from your hand.
• The net result is a loop that, with enough discarded cards or with a properly repeated trigger, grinds the target down in 1-point increments to zero.

The technical weak point: you're starting from a single cleanup step, so the base number of iterations is limited by the cards discarded that turn. You need a way to repeat the cleanup step or to force multiple discards in the same turn if you want to turn this into a true infinite rather than incremental burn.

Color identity and commander

Both cards are black: a package built for mono black shells or black-based value/aristocrats decks in general. Fitting suggestions:

• K'rrik, Son of Yawgmoth — mono black, lets you pay life instead of mana to protect the combo, synergizing with the life gain from Feast of Sanity that refills your buffer.
• Meren of Clan Nel Toth — B/G, if you want to house the combo in an aristocrats shell with recursion, turning the discard loop into a reanimation engine as well.
• Yawgmoth, Thran Physician — mono black, identical philosophy: resources converting into damage and life, an engine that loves repeated discards.
• Tinybones, Trinket Thief — mono black, budget-friendly, already naturally geared toward punishing opponents' hands and generating value from forced discards.

All four stay within a single color or two colors, requiring zero extra fixing: the combo slots in without stressing the mana base.

How to protect it

The main risk isn't an opponent countering the combo — it's the generic artifact/enchantment removal running rampant at every bracket 4 table.

• Keep generic backup protection for artifacts/enchantments in mind: Lightning Greaves doesn't help here (these aren't creatures), so the real defense is redundancy of pieces, not equipment.
• Play around removal by casting both pieces on separate turns if you're protecting a single mana resource, forcing your opponent to spend two removal spells instead of one to stop you halfway.
• If your commander offers recursion (Meren, Yawgmoth), use it to bring back a lost piece instead of holding it in hand as a dead backup.
• Sequence your other discard effects (fetches, loot effects, discard outlets) before cleanup to maximize the number of Feast of Sanity triggers in that same step.

Budget vs Premium

There isn't really a "premium" version here: the entire combo costs 24 cents, down 40% in two weeks. There's no slot where spending more gets you a functional upgrade — these two cards are the only way to pull off exactly this loop.

The only sensible investment is upstream: additional discard outlets (loot effects, cycling fetchlands, wheel effects) to make sure the cleanup step is never reached with an empty hand. That's where you actually allocate the deck's budget, not on the combo pieces themselves.

The verdict

The cost-to-impact ratio is off the charts: 24 cents for a repeatable damage engine in a color that already plays sacrifice and hand disruption. Bracket 4 is the right home for it — the loop isn't instant, it gives the table a window to react, and that's exactly what keeps it from getting your deck banned de facto by your playgroup. If you're running mono black or B/x aristocrats and don't already have two 12-cent slots free, you're wasting deck space.