Whenever you cast a spell, if mana from an artifact source was spent to cast it, you may pay 1 life. If you do, draw a card. Do this only once each turn.

Trample, haste

This spell costs {1} less to cast for each card in exile you don't own.
Trample
Ward—Exile a nonland, nontoken permanent you control.

Flying
Whenever you cast a spell that targets a single creature you control, bless that creature.

Whenever you amp it up, Pyrote Technician deals 2 damage to each opponent.

Flash
This spell costs {1} less to cast for each permanent with flash you control and each instant card in your graveyard.
Ward {2}

Whenever Radiant Chromate or another Advisor you control enters, an opponent may pay {1}. If they do, scry 1. Otherwise, put a +1/+1 counter on that creature.

Whenever Raksolcs Ravage-Soul deals combat damage to a player, create a Treasure token.
Whenever you sacrifice a permanent, Minotaurs you control get +2/+0 until end of turn. Creatures you control gain menace until end of turn. This ability triggers only once each turn.

When Rano's Slopeguard enters, you may exile cards from the top of your library until you exile a nonland card with mana value 2 or less, then put the rest on the bottom in a random order. You may cast the exiled card this turn.

Whenever you cast a spell that targets Rathomar Harrier, choose one. If Rathomar Harrier is attacking, choose both instead.
• Tap target creature you don't control.
• Create a 2/2 green Wolf creature token.

Whenever you cast a spell that targets Rathomar Herder, choose one. If Rathomar Herder is attacking, you may choose both instead.
• Create a 1/1 white Human creature token.
• Creatures you control get +1/+0 until end of turn.

Haste
Whenever you cast a spell that targets Rathomar Raider, target creature can't block this turn.

When Reaching Remnant enters, it deals 4 damage to target creature with flying you don't control.
Spellcharge 3

Flying
Whenever one or more creatures you control deal combat damage to a player, that player mills two cards.

Menace
When Reaper of the Deep enters, mill two cards. You may repeat this process until there are seven or more cards in your graveyard.
Surface {5}{B}{B}

Whenever Reborn Scuttler attacks, up to one target creature has base toughness 1 until end of turn.

Relentless Busker can't block.
{VP}{VP}{VP}: Return Relentless Busker from your graveyard to the battlefield.

Other creatures you control get +1/+1 and have vigilance.
Spellcharge 5

At the beginning of combat on your turn, you may pay {1}. If you do, create a 1/1 red and green Elemental creature token. It gains haste. Sacrifice it at end of combat.

When Resourceful Hireling enters, choose one —
• Create a 0/0 colorless Robot artifact creature token with a +1/+1 counter on it.
• Create a Treasure token.

Surface {2}{B}{G}{U}. Riverbed Snapper surfaces transformed.

Whenever Rogue Justiciar becomes the target of a spell or ability you control, you may tap target creature. This ability triggers only once each turn.

When Rotroot Hauler enters, mill three cards, then you may put a permanent card in your graveyard on top of your library.

Deathtouch
Landfall — Whenever a land you control enters, Sandstorm Dancer acclimates.

Prowess
When Satyr Arsonist enters, destroy up to one target nonbasic land. Its controller may search their library for a basic land card, put it onto the battlefield tapped, then shuffle.