Esper Sentinel

Whenever an opponent casts their first noncreature spell each turn, draw a card unless that player pays {X}, where X is Esper Sentinel's power.

Luxury Suite

Luxury Suite enters tapped unless you have two or more opponents.
{T}: Add {B} or {R}.

Search your library for an enchantment card, reveal it, put it into your hand, then shuffle.

Spectator Seating enters tapped unless you have two or more opponents.
{T}: Add {R} or {W}.

Vault of Champions enters tapped unless you have two or more opponents.
{T}: Add {W} or {B}.

If you would create one or more Treasure tokens, instead create those tokens plus an additional Treasure token.

Search your library for an artifact or enchantment card, reveal it, then shuffle and put that card on top.

If an effect would create one or more tokens under your control, it creates twice that many of those tokens instead.