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Commander
Flying, trample Falco Spara, Pactweaver enters the battlefield with a shield counter on it. You may look at the top card of your library any time. You may cast spells from the top of your library by removing a counter from a creature you control in addition to paying their other costs.
4 Alternatives
At the beginning of your upkeep, put a shield counter on target creature an opponent controls. Whenever you put one or more counters on a creature you don't control, tap that creature and goad it. It gains trample until your next turn. (Until your next turn, that creature attacks each combat if able and attacks a player other than you if able.)
When Lagrella, the Magpie enters the battlefield, exile any number of other target creatures controlled by different players until Lagrella leaves the battlefield. When an exiled card enters the battlefield under your control this way, put two +1/+1 counters on it.
When Perrie enters the battlefield, put a shield counter on target creature. (If it would be dealt damage or destroyed, remove a shield counter from it instead.) Whenever Perrie attacks, target creature you control gains trample and gets +X/+X until end of turn, where X is the number of different kinds of counters among permanents you control.
Rigo, Streetwise Mentor enters the battlefield with a shield counter on it. (If it would be dealt damage or destroyed, remove a shield counter from it instead.) Whenever you attack a player or planeswalker with one or more creatures with power 1 or less, draw a card.
Card Advantage
Whenever you attack, put a shield counter on target attacking creature. Until end of turn, it gains "Whenever this creature deals combat damage to a player, remove a shield counter from it. If you do, draw a card." (If a creature with a shield counter on it would be dealt damage or destroyed, remove a shield counter from it instead.)
Flying Sanctuary Warden enters the battlefield with two shield counters on it. Whenever Sanctuary Warden enters the battlefield or attacks, you may remove a counter from a creature or planeswalker you control. If you do, draw a card and create a 1/1 green and white Citizen creature token.
Hideaway 5 (When this enchantment enters the battlefield, look at the top five cards of your library, exile one face down, then put the rest on the bottom in a random order.) Whenever you draw your first card during each of your draw steps, draw a card. Then if you have nine or more cards in hand, you may play the exiled card without paying its mana cost.
Counter Matters
Agent's Toolkit enters the battlefield with a +1/+1 counter, a flying counter, a deathtouch counter, and a shield counter on it. (If it would be dealt damage or destroyed, remove a shield counter from it instead.) Whenever a creature enters the battlefield under your control, you may move a counter from Agent's Toolkit onto that creature. {2}, Sacrifice Agent's Toolkit: Draw a card.
Addendum — If you cast this spell during your main phase, put a shield counter on a creature you control. (If it would be dealt damage or destroyed, remove a shield counter from it instead.) Choose a kind of counter on a creature you control. Put a counter of that kind on each other creature you control.
Denry Klin, Editor in Chief enters the battlefield with your choice of a +1/+1, first strike, or vigilance counter on it. Whenever a nontoken creature enters the battlefield under your control, if Denry has counters on it, put the same number of each kind of counter on that creature.
+1: Choose up to one target creature. Put a +1/+1 counter and a counter from among flying, first strike, lifelink, or vigilance on it. −3: Look at the top seven cards of your library. You may put a permanent card with mana value 3 or less from among them onto the battlefield with a shield counter on it. Put the rest on the bottom of your library in a random order. −7: Create five 3/3 white Angel creature tokens with flying.
Hideaway 5 (When this enchantment enters the battlefield, look at the top five cards of your library, exile one face down, then put the rest on the bottom in a random order.) At the beginning of combat on your turn, put a +1/+1 counter on target creature you control. Then if you control a creature with power 7 or greater, you may play the exiled card without paying its mana cost.
At the beginning of combat on your turn, put a charge counter on Gavel of the Righteous. Equipped creature gets +1/+1 for each counter on Gavel of the Righteous. As long as Gavel of the Righteous has four or more counters on it, equipped creature has double strike. Equip—Pay {3} or remove a counter from Gavel of the Righteous.
Dethrone (Whenever this creature attacks the player with the most life or tied for the most life, put a +1/+1 counter on it.) Park Heights Maverick can't be blocked by creatures with power 2 or less. Whenever Park Heights Maverick deals combat damage to a player or dies, proliferate.
Voice of the Vermin enters the battlefield with a shield counter on it. (If it would be dealt damage or destroyed, remove a shield counter from it instead.) Whenever Voice of the Vermin attacks, target creature you control has base power and toughness 4/4 until end of turn.
Interaction
This spell costs {2} less to cast if it targets a black permanent. Bouncer's Beatdown deals X damage to target creature or planeswalker, where X is the greatest power among creatures you control. If that creature or planeswalker would die this turn, exile it instead.
Choose three. You may choose the same mode more than once. • Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.) • Target creature phases out. (Treat it and anything attached to it as though they don't exist until its controller's next turn.) • Counter target activated or triggered ability.
When Shield Broker enters the battlefield, put a shield counter on target noncommander creature you don't control. You gain control of that creature for as long as it has a shield counter on it. (If it would be dealt damage or destroyed, remove a shield counter from it instead.)
Land
Path of Ancestry enters the battlefield tapped. {T}: Add one mana of any color in your commander's color identity. When that mana is spent to cast a creature spell that shares a creature type with your commander, scry 1. (Look at the top card of your library. You may put that card on the bottom.)
Mana Ramp
When Spara's Adjudicators enters the battlefield, target creature an opponent controls can't attack or block until your next turn. {2}, Exile Spara's Adjudicators from your hand: Target land gains "{T}: Add {G}, {W}, or {U}" until Spara's Adjudicators is cast from exile. You may cast Spara's Adjudicators for as long as it remains exiled.
Other
You may have Undercover Operative enter the battlefield as a copy of any creature on the battlefield, except it enters with a shield counter on it if you control that creature. (If it would be dealt damage or destroyed, remove a shield counter from it instead.)