Riftbound Unit: Masa, Crashing Thunder. You may pay [C] as an additional cost to play me. When you play me, if you paid the additional cost, [Stun] an enemy unit at a battlefield. (It doesn't deal combat damage this turn.)
Riftbound Unit: Rengar, Trophy Hunter. [Ambush] (You may play me as a [Reaction] to a battlefield where you have units.) I can be played to a battlefield where there are enemy units (even if you don't have units there).
Riftbound Unit: Sivir, Ambitious. [Deflect 2] (Opponents must pay [A][A] to choose me with a spell or Ability.) When I conquer after an attack, if you assigned 5 or more excess damage to enemy units, you may deal that much to an enemy unit.
Riftbound Unit: Rengar, Trophy Hunter. [Ambush] I can be played to a battlefield where there are enemy units.
Riftbound Gear: Seal of Insight. [T]: [Reaction] β€” [Add] [C]. (Abilities that add resources can't be reacted to.)