Battlefield Improvisation

an Equipment you control — 628 cards in the game can cause this (Battlefield Improvisation is one).

When you cast Battlefield Improvisation, it counts:

1. Foot Chopper — and
2. Adaptive Omnitool — and
3. Saw — and
4. Mace of the Valiant — and
5. Sword of the Meek — and
6. Ronin Warclub — and
7. Dredging Claw — and
8. Stormrider Rig — and
9. Doc Ock's Tentacles — and
10. Hero's Blade — and

618 other cards care about it too. These are the ones with the most connections.

an instant is cast — 3,931 cards in the game can cause this (Battlefield Improvisation is one).

When Battlefield Improvisation is cast:

1. Lunar Mystic — draws you 1 card
2. Ojer Pakpatiq, Deepest Epoch // Temple of Cyclical Time — grants rebound
3. Repeated Reverberation — copies an ability
4. Bill Potts — copies an ability
5. Riku of Two Reflections — copies a spell
6. Sword of Wealth and Power — copies a spell
7. Lilah, Undefeated Slickshot — gets +1/+1
8. Gale, Waterdeep Prodigy — brings a card back
9. In the Eye of Chaos — counters a spell
10. Niblis of Frost — taps a creature an opponent controls

427 other cards care about it too. These are the ones with the most connections.

anything is cast — 31,128 cards in the game can cause this (Battlefield Improvisation is one).

When Battlefield Improvisation is cast:

1. Windrider Wizard — draws you 1 card
2. Relic Amulet — puts a charge counter on itself
3. Rockslide Sorcerer — deals 1 damage
4. Umara Wizard // Umara Skyfalls — grants flying
5. Alania, Divergent Storm — makes an opponent draw 1 card
6. Umara Mystic — gets +2/+0
7. Master of Winds — triggers

5 other cards care about it too. These are the ones with the most connections.